Minerals from Different Locations

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$25.00

M200b  This is a very nice Barite and Calcite combination specimen on a matrix.   This very cool specimen has well defined dark Honey Golden colored Barite Crystals mixed in with the matrix.  The lovely Barite crystal on one side is almost 2" long and the specimen overall measures 1" x almost 1" x over 1 1/8" and has a nice natural appearance.  The tip of the large crystal is not perfect and is reflected in our price.  This interesting specimen is from Meade County of South Dakota. 

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Barite is a mineral consisting of Barium sulfate and is generally white or colorless.  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.

Calcite is a Carbonate mineral that is most widely distributed on the Earth's surface.  It is a common constituent of sedimentary rocks with Limestone in particular.  A Calcite formation can take on many different shapes and sizes which is dependent on the location, ground water occurrence and temperature.  Calcite is usually white or colorless but can be gray, red, yellow, green, blue, violet, brown or black.  The deeper the color is usually indicative of the definitive impurities from the earth or water.

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South Dakota Barite

$50.00 M201c  This is a splendid Pyrite specimen from China .  This very interesting specimen has an excellent quality Pyrite cubes in matrix with contrasting sugar white Calcite crystals. It measures approximately 2 5/8" x 2 1/4" x2".  Very, very cool!!

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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

$90.00

M202c   Here is something very different;  an exceptional  Quartz Cluster from Madagascar.  It has a fabulous array of different sized crystals protruding in all directions in a captivating design. It measures 6 7/8" x  7" x 3 5/8" and has not been polished.    Very cool!

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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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Quartz Cluster

$50.00 M203c  This is a very nice specimen with bright yellow Sulfur crystals.  It measures 4 3/4" x  3 5/8" x 2 3/8" and has not been polished.  This excellent Sulfur specimen has very nicely defined and sparkly crystals. This material is from Durango, Mexico.

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Crystals of Sulfur are usually yellow to yellowish-brown blocky dipyramids. Also it is found more typically as powdery yellow coatings. Native Sulphur is usually formed from volcanic action - as a sublimate from volcanic gasses associated with Realgar, cinnabar and other minerals. It is  found in some vein deposits as an alteration product of sulfide minerals.

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Sulfur

$45.00 M204b   Here is a very nice Watermelon Tourmaline specimen from Brazil. This interesting specimen measures 3 1/4" x 2 3/4" x  2" and has awesome sparkly high quality Green and Pink colored crystal Tourmaline.   Very 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.

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 Watermelon Tourmaline

$28.00 M205b  This is a nice specimen of natural Copper from Ray Mine Pinal County Arizona. This is natural native copper which has been mostly removed from the matrix rock which was surrounding it. There is matrix rock visible in some areas of the specimen.  It measures 1 7/8" x 1 3/4" x 1 1/4". Very nice.

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Click here to view  more Copper specimens !!

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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Natural Copper

$20.00

M206b   This is a very nice Galena specimen with lots of character and design. It measures 1 1/2" x 3 1/8" x 1 3/8" and has a natural shiny appearance.  The mineral is quite heavy for it's size as it falls into the heavy metal category of minerals. This very cool specimen weighs nearly 1/2 pound.

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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 communicatcon systems.  It is usually dark grey to black in color with a shiny iridescence.

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Galena

$22.00 M207b  This nicely polished Septarian Slab is from Utah.  It measures 5 3/8" x 5 1/2" x 1/2" thick and has been nicely polished on the front face. This Septarian Nodule slab has beautiful Yellow Calcite bordered with pretty brown Aragonite and even some subtle "rainbow" reflections in the crystal.  A definite beauty to behold. 

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Click Here to See More Septarian Specimens.

Septarians are commonly composed of a carbonate mineral such as Calcite, a microcrystalline form of Silica as in Flint or Jasper, or an Iron Oxide such as Hematite.  These specimens are also known as a concretion which is a type of sedimentary rock. Septarians were formed millions of years ago by sediment forming around a fossil to create a mud ball transforming the fossil into Calcite and Aragonite.

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Septarian Slab

$80.00 M208c  Here's an absolutely stunning Crystal Quartz Cluster from Brazil.  It measures 6 1/2" x 5" x 1" and has a natural finish. It has seemingly endless crystals in various sizes pointing in all direction giving it a great appearance! The crystals have exceptional clarity and abundant "rainbow" reflections to add to it's fabulous character. The crystals have the appearance of being compressed still amazingly all in tact. DISCLAIMER: This does have delicate crystals and although we have had great success in shipping such delicate items it may have some smaller crystals come loose and fall off during shipping. This is unavoidable but rest assured there are still plenty of amazing crystals to enjoy.  Grab this beauty quick!

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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

$50.00 M209b   Here is an outstanding specimen of Apophyllite Crystals with Stilbite. This beauty is a one of a kind, very well defined specimen with the sparkly nearly clear Apophyllite crystals that will not be duplicated.  It measures 3 5/8" x  2 1/2" x  2 1/8" and has a natural sparkly finish. This material is from Jalgaon, India.  Just very nice!!

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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.

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.

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Apophyllite Stilbite

$40.00

M210c  This is a nice Smokey Quartz cluster specimen with multiple tips of various different sizes.  It measures almost 5 3/8" x 2 5/8" x over 2 1/8" and has a pretty sparkly appearance.  Most of the tips are very nice but there are some broken crystals, typical for this material.  This beautiful specimen is from Brazil.  Very, very nice! 

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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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Smokey Quartz

$55.00 M211b  Here is a very nice Dog Tooth Calcite Crystal.  It measures 8 7/8" x almost 4 1/4" x 2 1/2" and has an all natural exterior.  This specimen has many sharply pointed Crystal points with Pinkish Brown tinted pyramid-shaped centers and an iridescent shine.  There are also tiny clear crystals on much of it that provides a "frosted" look.  A super gift.

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Calcite is a Carbonate mineral that is most widely distributed on the Earth's surface.  It is a common constituent of sedimentary rocks with Limestone in particular.  A Calcite formation can take on many different shapes and sizes which is dependent on the location, ground water occurrence and temperature.  Calcite is usually white or colorless but can be gray, red, yellow, green, blue, violet, brown or black.  The deeper the color is usually indicative of the definitive impurities from the earth or water.

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Dog Tooth Calcite

$75.00

M212c   Here is something very different at the Rock Shed.  This is a high quality specimen of Fluorite in a matrix from China.  The pretty Aqua Green Fluorite crystals of various sizes are scattered about the matrix.  The lovely specimen measures almost 3 5/8" x nearly 2 7/8" x almost 2 1/8" and has its own natural shine in areas.  This all natural mineral has an unique character and makes a great addition to your collection. 

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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

$45.00 M213c  Here is an outstanding and interesting combination specimen of Silicon Carbide. This unique mineral has well defined dark Crystals of different sizes in opposite sides with a sparkly Green, Blue and Purple sheen in the light that changes from different directions.  It measures 6 7/8" x 2 5/8" x  2 1/8" and has an all natural texture and finish. It is very difficult to capture the full brilliance of the diverse colors but it is very colorful and sparkly. This is a one-of-a-kind mineral for the one-of-a-kind mineral collector and something very different!

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Silicon carbide, also known as carborundum, is a compound of silicon and carbon and occurs naturally as ultra rare moissanite. Silicon carbide powder has been mass-produced since 1893 for use as an abrasive. Grains of silicon carbide can be bonded together by sintering to form very hard ceramics widely used in applications requiring high endurance, like as car brakes or ceramic plates in bulletproof vests. Electronic applications of silicon carbide as light emitting diodes and detectors began over 100 years ago and continue today are widely used in high-temperature/high-voltage semiconductor electronics. Large single crystals of silicon carbide can be grown by the Lely method; they can be cut into gems known as "synthetic moissanite".

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Silicon Carbide

$50.00

M214c   Here is a rather unique find at the Rock Shed.  This is a very large Tourmaline in a bed of beautiful Quartz from Madagascar.  It measures 7" x 3 3/4" x 6 3/4" and weighs nearly 7 pounds. Very Nice!

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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.

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.

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 Quartz Tourmaline

$20.00

M215c  Here is something very different! This is a lovely South Dakota Garnet found right here in the Black Hills by our very own Resident Geologist who is an avid Rock Hunter.  It has great color and neat design. This specimen measures 3 3/8" x 1" x 1 1/8", the larger Garnet is 5/8" x 1/2" and the smaller is 1" x 1".  This very interesting piece and would complete any serious collection.

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Garnet is included in a group of minerals that have been used since the Bronze Age as gemstones and abrasives. Garnets are most often as seen in red, but are available in a wide variety of colors spanning the entire color spectrum except blue. There are six common species of Garnet that are recognized by their chemical composition: Pyrope, Almandine, Spessartite, Grossular, which includes Hessonite and Tsavorite, Uvarovite and Andradite.

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South Dakota Garnet

$16.00

M216b  Here is something different for the mineral collector.  This is a very nice specimen of Wavellite crystals in matrix and is from Arkansas.  This interesting mineral measures 2 3/8" x 1 3/4" x 7/8". A really different mineral for the mineral collector.  Very cool!

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Chemically, Wavellite is Hydrated Aluminum Phosphate Hydroxide.  It is a secondary mineral found most often in aluminous, low-grade metamorphic rocks.  Normally it forms as radiating "starburst" clusters of green to yellow-green crystals.  It will show its fibrous structure on fracture surfaces in the matrix.

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Wavellite

$70.00

M217c  Here is a exceptionally nice Green Epidote specimen from Brazil.   It has very nice Green Epidote crystals of different sizes and pointing in all different directions.  This very interesting and pretty specimen measures 4 1/2" x 3" x 1 3/4" tall.   Very nice.

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Epidote is an abundant rock-forming mineral, but one of the secondary origin. Many of the characters of the mineral vary with the amount of iron present. Prismatic, columnar crystals, often shiny, finely striated faces. The color is green, gray, brown or nearly black but usually a characteristic shade of yellowish-green or pistachio green.

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Epidote

$10.00 M218c  Here is a new and different item at the Rock Shed.  This a very nice, very interesting Rosasite and Limonite specimen from Mapimi, Mexico.  It has a very pretty Aqua blue Rosasite on the Limonite matrix.  This fantastic mineral measures 1 1/2" x 1 1/4" x 1" and has a super natural appearance.  A great way to begin your mineral collection!!

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Rosasite is an uncommon mineral belonging to the Carbonate group of minerals. It has a minor potential for use as zinc or copper ore as is typically associated with Copper deposits including Limestone which is the source of the Carbonate.

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Rosasite

$35.00 M219c  This is a very different and pretty specimen of a gorgeous vibrant Blue Cavansite Crystal on matrix. This unique and rare specimen measures 1 1/2" x 1 1/2" x 1 1/4" thick and would be a good addition to any collection.  This material is from Pune, India.  Very nice.

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Cavansite is a deep blue hydrous calcium vanadium phyllosilicate mineral, occurring as a secondary mineral in variety of zeolite minerals.       

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Cavansite

$20.00 M220b  This is a unique mineral specimen of Fluorite with Pyrite from The Minerva Mine #1 in Harden County, Illinois.  This lovely specimen measures 2 1/2" x 1 1/2" x  1/8 .  Very nice!

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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 - Pyrite

$30.00 M252c  A nice specimen of natural Copper from Keweenaw Peninsula, Michigan. This is natural native copper which has been mostly removed from the matrix rock which was surrounding it.  It measures 3" x  1 7/8" x 1 5/8" thick and has a natural rough exterior. The shape of it in certain angles resembles a turtle.

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Click here to view  more Copper specimens !!

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.

mineral

 Copper


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