Minerals from Different Locations

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$65.00 M600c This is an exceptional specimen of Tourmaline and Smokey Quartz in matrix from Brazil. This incredible specimen measures 5 1/2" x  3 3/8" x 3"; weighs nearly 2 pounds and has not been polished.  It has several well defined  Tourmaline  imbedded in the matrix. Just nice!

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The Tourmaline mineral group is chemically one of the most complicated groups of Silicate minerals.  Its composition varies widely with Sodium, Calcium, Iron, Magnesium, Lithium, Aluminum, Boron and other elements.  It has a wide variety of colors including black, blue-black, brown, yellow, red, green, pink and is rarely colorless.  This mineral is found in igneous rocks, like Granite Pegmatite, and metamorphic rocks such as Schist and Marble.

Quartz is the second most common mineral in the Earth's continental crust.  It is mainly composed of Silica or Silica based minerals.  Although Quartz is known by a variety of names, the most important distinction between types of Quartz is that of macro-crystalline, individual crystals visible to the unaided eye, and micro-crystalline, where aggregates of crystals are only visible under high magnification.  There are many forms of Quartz including Chalcedony, Amethyst, Citrine, and Carnelian which are results of mineral impurities or heat treatments.

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Tourmaline - Smokey Quartz


$150.00 M601c  Here is an exceptional specimen of Cobaltocalcite or Sphaerocobaltite from Morocco.  This unusual and eye catching specimen has a natural Pink color with a cool Botryoidal texture with lots of character.  It measures 5 3/8" x 2 7/8" x 2 3/4" and has a natural sparkly shine. A very nice, unique specimen.

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Sphaerocobaltite, also known as Cobaltocalcite or Cobaltian-calcite, is a colorful and beautiful mineral.  The deep rose-red to pink color it has makes is easy to confuse with Rhodochrosite or Stichtite as all have the similar red to pink colors. Impure specimens can be shades of pink to pale brown. It is found as crusts and small crystals in many cobalt ore locations.

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Cobaltocalcite


$30.00

M602c  This is something different for the mineral collector.  Here is a nice specimen of Vera Cruz Amethyst from Mexico.  The pretty specimen measures 2 3/4" x 2 3/8" x 1" and has a natural super sparkly appearance.  This lovely piece has an excellent array of various shades of Purple Amethyst Crystals.  Just plain beautiful!

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Click here to view more Amethyst specimens!

Amethyst is a purple variety of Quartz often used as an ornament.  Upon exposure to heat, Amethyst generally becomes yellow, which some refer to as Citrine or "burnt" Amethyst.  It occurs in color from a light, slightly pinkish violet to a deep grape purple.  It is widely distributed as a mineral.

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Vera Cruz Amethyst

$45.00 M603c  Here is a very nice quality combination specimen of Wulfenite and Mimetite from Durango, Mexico.  This exceptional piece has some very small Yellow Wulfenite crystals of different sizes and shapes poking out in all directions from the pretty green Mimetite and rust colored matrix.  No matter from what angle you look at it, it's just plain gorgeous.  This beautiful, rarer combination mineral measures nearly 3 5/8" x almost 3 1/8" x nearly 2 1/8" and has a natural, unpolished appearance with sparkly iridescence.   Very, very cool!

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Wulfenite is a lead molybdate mineral named for an Austrian mineralogist. It is most often found as stubby, pryamidal or tabular crystals in a bright orange-red to yellow-orange color. It is found in many locations, associated with lead ores as a secondary mineral and often found with Cerussite, Smithsonite, Hemimorphite, Vanadinite, Mimetite and other minerals. Among the more notable locations for finding Wulfenite are Pennsylvania, Arizona and Mexico.  

Mimetite is an Arsenic mineral often associated with Lead, Galena, Vanadinite, Wulfenite, Calcite and Arsenopyrite.  It resembles Pyromorphite as it falls in the same series of minerals as Pyromorphite and Vanadinite.  Mimetite is known as a collector's specimen often creating botryoidal crusts on the the surface of the specimen.  It is not used as a gemstone due to its softness.

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Wulfenite Mimetite

$85.00 M604b  Here is a very unique piece of Tourmaline with Feldspars from Morocco.  It has a beautiful range of nicely defined crystals with a natural shine.  It measures 5 1/2" x 4" x 2 3/4".  Due to the nature of this specimen you may find lots of "crumbs", this is normal and the stability of the mineral is not affected by the "crumbs" it sheds.  Absolutely amazing.

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Tourmaline is one of the most chemically complicated of all Silicate minerals. It is a complex Silicate of Aluminum and Boron and the composition varies widely with Sodium, Calcium, Iron, Magnesium, Lithium and many other elements that enter into it's structure. It can occur in a long, slender needle-like crystal to a thick prismatic and columnar crystal to a radial like daisy formation. It comes in many colors usually black and brown (iron rich); brown and yellow (magnesium rich); and blue, red, green, yellow, and pink (lithium rich). This mineral is found in igneous rocks, like Granite Pegmatite, and metamorphic rocks such as Schist and Marble.

Feldspars are a group of rock-forming tectosilicate group of minerals containing potassium, sodium, calcium and aluminium silicatesminerals that make up as much as 60% of the Earth's crust. They are the most common rock-forming minerals. Feldspars crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Feldspars are also found in many types of sedimentary rock.

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 Tourmaline Feldspars


$20.00 M605b  Here is a very nice specimen of Smithsonite from Chihuahua, Mexico.  It has an unusual pretty pale Purple color combination desired by many collectors.  It measures 2 1/2" x  2" x 1 1/2" thick with a natural unpolished botryoidal surface.  Just very cool!

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Smithsonite is a mineral ore of zinc, commonly confused with Hemimorphite until it was realized they are two distinct minerals. They are similar in appearance and are found in similar colors. Smithsonite often occurs in association with other minerals like Hemimorphite, Willemite, Cerussite, Malachite and Azurite. It was named in honor of James Smithson first identified the mineral and whose bequest established the Smithsonian Institution.

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Smithsonite

$175.00 M606c  Here's a cool new item, a very nice larger Pyrolusite from Morocco. It measures 9" x 4 7/8" x 3" and weighs nearly 5 pounds.  This is a one-of-a-kind mineral for the one-of-a-kind mineral collector.

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Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese. It is a black, amorphous appearing mineral, often with a granular, fibrous, or columnar structure, sometimes forming reniform crusts.

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Pyrolusite

$50.00

M607b   Here is a very different and nice interesting specimen of a Keokuk Geode filled with sparkly Quartz crystals surrounded by the yellow colored matrix rock. The gorgeous is loaded with clear crystals that protrude in all different ways.  The entire specimen is 5 7/8" x  5 3/4" x 2 3/4" with an all natural texture and finish. This astonishing work of nature is from Keokuk, Iowa.  

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Quartz is the second most common mineral in the Earth's continental crust.  It is mainly composed of Silica or Silica based minerals.  Although Quartz is known by a variety of names, the most important distinction between types of Quartz is that of macro-crystalline, individual crystals visible to the unaided eye, and micro-crystalline, where aggregates of crystals are only visible under high magnification.  There are many forms of Quartz including Chalcedony, Amethyst, Citrine, and Carnelian which are results of mineral impurities or heat treatments.

Geodes are geological rock formations which occur in sedimentary and certain volcanic rocks.  They are essentially rock cavities or vugs with internal Crystal formations or concentric banding.  The exterior is generally Limestone while the interior contains Quartz Crystals and/or Chalcedony deposits.  If the Geode is completely filled with Crystal, being solid all the way through, it is then called a nodule.

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Keokuk Quartz Geode

$60.00

M608c  Here is something really different for you mineral collection!!  This is a very nice, above average quality Pyrite Tree.  It measures 4"  x  1 1/8" mounted on a plastic base 7/8" square and has a natural appearance. They date in age to 350 million years old.

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Pyrite, or Iron Pyrite, is an Iron sulfide with isometric Crystals that usually appear as cubes.  It is brittle and can break or powder easily.  Its metallic luster and brass yellow hue have earned it the nickname of "fool's gold" due to many miners mistaken it for the real thing.  Ironically, small quantities of actual gold are sometimes found in Pyrite.  It is the most common of the sulfide minerals and is usually found with other sulfides or oxides in Quartz veins, sedimentary or metamorphic rocks. 

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Pyrite Tree

$30.00 M609c   Here is a new find at the Rock Shed.  This is an excellent quality specimen of Aquamarine or Beryl from South Dakota.  The interesting and unique specimen measures 3 1/8" x 2" x 2 3/8".   It has great color and a natural  texture. Very, very nice!

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Aquamarine (from Latin: aqua marina, "water of the sea") is a blue or cyan variety of beryl. It occurs at most localities which yield ordinary beryl. Beryl is a mineral composed of beryllium aluminium cyclosilicate. The pale blue color of aquamarine is attributed to Fe2+ (or iron). The Fe3+ ions produce golden-yellow color, and when both Fe2+ and Fe3+ are present, the color is a darker blue as in maxixe. In the United States, aquamarines can be found in the Sawatch Range in central Colorado and in the Big Horn Mountains of Wyoming.

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Aquamarine

$85.00

M610c  Here is a gorgeous specimen of Vanadinite on matrix.  It measures 3 1/8" x 2 1/2" x 2 1/8" and has many sparkly Red and burnt Orange colored hexagonal Vanadinite crystals all over the matrix.  This is a beautiful work of nature and very fragile. This mineral is from Morocco.

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Vanadinite is a mineral belonging to the Apatite group of Phosphate minerals.  It is one of the main industrial Ores of the metal Vanadium and a minor source of Lead.  Vanadinite is relatively uncommon and is associated with Galena, Wulfenite, Limonite and Barite.  It is usually bright red or orange-red in color although it may sometimes be brown, red-brown, grey, yellow or colorless.

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Vanadinite

$100.00

M611c  This is a very nice, above average quality Smokey Quartz specimen.  Under close inspection, this very cool crystal has lots of rutiles and phantom lines inside that photographs don't do justice.  It measures 4 3/4" long x 2 1/2" x 1 1/2" and has a pretty sparkly appearance.  This Smokey Quartz crystal is all natural and has not been heat treated but does have minor tip damage.  This material is from Arkansas.

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Quartz is the second most common mineral in the Earth's continental crust.  It is mainly composed of Silica or Silica based minerals.  Although Quartz is known by a variety of names, the most important distinction between types of Quartz is that of macro-crystalline, individual crystals visible to the unaided eye, and micro-crystalline, where aggregates of crystals are only visible under high magnification.  There are many forms of Quartz including Chalcedony, Amethyst, Citrine, and Carnelian which are results of mineral impurities or heat treatments.

smokey quartz

Smokey Quartz

$22.00

M612b   This is a nice natural native copper specimen from Pennsylvania which has been partly removed from the matrix rock which was surrounding it.  The white quartz matrix rock is visible in many areas.  It measures 4 3/8" x nearly 2 1/8" x almost 1 1/4" and has a natural texture and finish.  Just a nice specimen of something different!

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Copper is a reddish colored metal with a high electrical and thermal conductivity.  It has its characteristic color because it reflects red and orange light and absorbs other frequencies in the visible spectrum due to its band structure.  It is in the same family as Silver and Gold and is a malleable metal.  It is beautiful natural or polished. 

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Copper

$350.00

M613c  Here is a gorgeous specimen of Vanadinite on matrix.  It measures 5 1/8" x 4" x 2 1/2" and has many bright Red and burnt Orange colored hexagonal Vanadinite crystals of all sizes.  This is a beautiful work of nature and is absolutely stunning. This mineral is from Morocco.

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Vanadinite is a mineral belonging to the Apatite group of Phosphate minerals.  It is one of the main industrial Ores of the metal Vanadium and a minor source of Lead.  Vanadinite is relatively uncommon and is associated with Galena, Wulfenite, Limonite and Barite.  It is usually bright red or orange-red in color although it may sometimes be brown, red-brown, grey, yellow or colorless.

hemimorphite

Vanadinite

$85.00 M614b   Here is a very nice, above average quality specimen of Stilbite Apophyllite with Druzy Quartz from India.  It has fabulous contrast of colors in an amazing design.  The beautiful mineral measures 4 7/8" x 4 1/8" x 2" thick and has a very attractive appearance.  Absolutely stunning.

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Stilbite is another Silicate mineral from the Zeolite family. It is often characterized by its sheaf like aggregates. The color is usually white or pink and when the cleavage is perfect, will have a distinct pearly luster.

Apophyllite, a Zeolite, is Silicate mineral with very well defined clear Crystals and is very popular as a collector's mineral. The Crystal structure will refract like in obvious rainbows and can form "natural pyramids" when tumbled.

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Stilbite Apophyllite with Druzy Quartz

$45.00 M615b  Here is something different for the mineral collector.  This is a very nice, above average quality Fluorite specimen. This new item is  from Mexico. The lovely mineral specimen has very pretty purple colored Fluorite  crystals all in a natural and unpolished state.  It measures 3 1/8" x 3 3/8" x 2 3/4" with an unique and beautiful appearance.

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Fluorite, also referred to as fluor-spar, is a mineral composed of Calcium Fluoride.  It is a widely occurring mineral found world wide and is often found with metallic minerals such as Galena, Sphalerite, Barite, Quartz and Calcite.  Fluorite may fluoresce strongly in ultraviolet light which may be due to the presence of some impurities such as Yttrium.  Blue is the most common color but red, purple, green, yellow and white are also frequent.  It can be used in high performance telescopes, camera lens, enamels and in the making of opalescent glass.

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 Fluorite

$28.00 M616c  Here is something different for the mineral collector.  This is a very nice, above average quality combination mineral which includes White Quartz, sparkly Pyrite and Galena all wrapped up in one super specimen.  The mineral group measures 2 1/2" x 2 1/2" x 1 5/8" and has a beautiful appearance.

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Pyrite, or Iron Pyrite, is an Iron sulfide with isometric Crystals that usually appear as cubes.  It is brittle and can break or powder easily.  Its metallic luster and brass yellow hue have earned it the nickname of "fool's gold" due to many miners mistaken it for the real thing.  Ironically, small quantities of actual gold are sometimes found in Pyrite.  It is the most common of the sulfide minerals and is usually found with other sulfides or oxides in Quartz veins, sedimentary or metamorphic rocks. 

Galena is the natural mineral form of Lead Sulfide.  It is the most important Lead ore mineral and is one of the most abundant and widely distributed sulfide minerals.  It is often associated with Sphalerite, Calcite and Fluorite.  Galena deposits often contain significant amounts of Silver, Zinc, Cadmium, Antimony Arsenic and Bismuth.  It is used as a semiconductor in early wireless communication systems.  It is usually dark grey to black in color with a shiny iridescence.

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 Pyrite-Quartz-Galena


$26.00 M617b  Here is a sparkly Stilbite specimen. The pretty specimen has a nice unique appearance with the light peach colored Stilbite on the matrix rock.  This cool mineral measures 4 3/4" x 3 1/2" x 1 7/8".  A great way to begin your mineral collection!  This material is from Jalgaon, India.

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Stilbite is another Silicate mineral from the Zeolite family.  It is often characterized by its sheaf like aggregates.  The color is usually white or pink and when the cleavage is perfect, will have a distinct pearly luster.

mineral

 Stilbite

$550.00

M619c  This is an amazing new item at the Rock Shed. This is a Limonite after Pyrite Pseudomorph from Gachala, Columbia. This beautiful large specimen shows the classic cross style of twinning from Columbia. It measures 3 5/8" x 3 3/4" x 3 1/2" and weighs a whopping nearly 4 1/4 pounds. It has several areas where it's Limonite edges have chipped off throughout time exposing a little bit of it's Pyrite center. Truly a collector's piece!

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Limonite after Pyrite is formed when Pyrite begins to decompose through chemical weathering and the iron present in the mineral starts to rust. Limonite is any impure hydrated iron oxide. Limonite is mostly clay but also may contain phosphates and silica. Once the rust has started, Limonite slowly starts to form. Limonite does not have one specific shape or crystal structure. Limonite pseudomorphs (takes the external shape) of other minerals such as Pyrite. Most Limonite has a brownish red color and leaves varying streak of color as the composition of Limonite could be made up of a different amount of phosphates or silica.

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Limonite

$45.00

M620b  Here is something really different for you mineral collection!!  This is an amazing blend of Barite, Cerussite and Galena from Mibladen, Morocco.  It measures 2 1/4" x 1 3/4" x 1 1/8" and has a natural shiny appearance on all sides.  This unique and gorgeous specimen has a great variety of the three different minerals in a spectacular design.  A wonderful and unique specimen for your mineral collection!

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Barite or Baryte is a mineral consisting of Barium sulfate and is generally white or colorless. The baryte group consists of baryte, celestine, anglesite and anhydrite. Baryte commonly occurs in lead-zinc veins in limestones, in hot spring deposits, and with hematite ore. It is used in the manufacture of paints and paper. Although Barite contains a 'heavy' metal, Barium, it is not considered to be a toxic chemical because of its extreme insolubility.

Cerussite (also known as white lead ore) is a mineral consisting of Lead Carbonate or an important or of Lead. Mineral collectors appreciate it's sparkle and the twinned crystals. It is usually colorless or white, sometimes grey or greenish in tint and is very brittle. Cerussite belongs to the Aragonite group minerals and is found in the oxidation zone of lead deposits usually associated with Galena.

Galena is the natural mineral form of Lead Sulfide. It is the most important Lead ore mineral and is one of the most abundant and widely distributed sulfide minerals. It is often associated with Sphalerite, Calcite and Fluorite. Galena deposits often contain significant amounts of Silver, Zinc, Cadmium, Antimony Arsenic and Bismuth. It is used as a semiconductor in early wireless communication systems. It is usually dark grey to black in color with a shiny iridescence.

 

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Barite Cerussite Galena

$65.00

M621c   Here's an amazing Crystal Quartz. It measures 1 5/8" x 1 1/2"x 5 3/8" tall and has a great polish. It has fabulous clarity, "rainbow" reflections and great inclusions! As an added bonus it has a cool Phantom Crystal (as shown in the last photo) whose tip is in the "clouds". A great addition for the crystal lover!

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Quartz is the second most common mineral in the Earth's continental crust.  It is mainly composed of Silica or Silica based minerals.  Although Quartz is known by a variety of names, the most important distinction between types of Quartz is that of macro-crystalline, individual crystals visible to the unaided eye, and micro-crystalline, where aggregates of crystals are only visible under high magnification.  There are many forms of Quartz including Chalcedony, Amethyst, Citrine, and Carnelian which are results of mineral impurities or heat treatments.

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Crystal Quartz

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