Minerals from Different Locations

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$40.00 M217b  Here is a new find in the Rock Shed mineral department.  This is an above average quality, larger piece of Goethite.  It measures 3" x 3 3/4" x 2 1/4" and has a natural rough texture.  Goethite has a White Crystalline Calcite structure with unique Iron Ore compositions.  This material is from Mexico.

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Goethite is an Iron bearing Oxide mineral found in soil and other low temperature environments.  Historically, Goethite has been used as a paint pigment found on cave paintings in France.  Its main modern use is that of an Iron Ore content or objects using Iron Ore.  Goethite is found worldwide usually in the form of concretions, stalactitic formations, oolites, reniform or botryoidal accumulations.

goethite

Goethite

$20.00 M218c  Here is a new and different item at the Rock Shed. This a very nice, very interesting Rosasite, Hemimorphite and Limonite specimen from Mapimi, Mexico. It has a very pretty Aqua blue Rosasite mixed in with clear Hemimorphite crystals on the Limonite matrix.  This fantastic mineral measures over 2" x 1/2" x nearly 1 3/8" x almost 1 3/4" and has a super sparkly 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. 

Hemimorphite is a Silicate mineral that is chiefly associated with Smithsonite.  It is more rare than Smithsonite due to the development of Crystals.  It may show strong green fluorescence in short wave ultraviolet light and weak light pink fluorescence in long wave ultraviolet light.  It is found worldwide.

Limonite is an ore consisting of a mixture of hydrated Iron Oxide-Hydroxide of varying composition of minerals such as Goethite, Lepidocrocite, or Jarosite.  It has been mined with Hematite as an Ore for the production of Iron. Limonite is heavy and has a yellow-brown color.  It is often used as the pigment ochre in many paints.

azurite

Rosasite Heminorphite Limonite

$48.00 M208c  Here is a gorgeous specimen of Malachite on matrix from the Milpillas Mine in Sonara, Mexico.  This mine is no longer open to mineral collectors.  The lovely specimen has plush velvety green crystals covering the entire top like a carpet.  The Malachite measures  nearly 3 5/8" x 1 3/4" x over 1 3/8" and is unpolished or altered.  The unsurpassed example has lots of personality with distinctive natural beauty!

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Malachite is a Copper Carbonate mineral that often forms botryoidal, fibrous or stalagmitic masses.  It is often the result of the weathering of Copper Ores and is commonly found with Azurite, Goethite and Calcite.  It is typically associated with Copper deposits including Limestone which is the source of the Carbonate.  Malachite is found in many regions world wide and is usually shaded green in color.

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Malachite

$28.00 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 nearly 4 3/4" x 2 5/8" x 3/4" thick and has a natural rough exterior.

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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.

native copper

 Copper

$30.00

M210c  This is a nice Smokey Quartz specimen.  It measures over 4" x 2 1/2" x almost 2" tall and has a pretty sparkly appearance.  This Quartz material has been heat treated which gives it the deep, rich Black color.  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

$40.00

M200c  This is a very nice Barite and Calcite combination specimen on a Limestone matrix.   This cluster has well defined dark Honey Golden colored Barite Crystals with other smaller ones nearby mixed in with Yellow Calcite beds.  The lovely specimen measures almost 5 1/4" x over 3 1/4" x almost 3 1/8" and has a nice natural appearance.  This cool 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.

mineral

South Dakota Barite

$14.00 M213b  Here are very nice interesting combination specimen of Silicon Carbide.  It measures almost 3 5/8" x 1 5/8" x nearly 1 3/4" and has a natural texture and finish.  This mineral has well defined dark Crystals with a sparkly Green and Purple sheen in the light that changes from different directions. 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".

mineral

Silicon Carbide

$50.00 M215c  Here is something different! This is a lovely Dolomite and Quartz Crystal specimen with some out croppings of Calcite. This larger specimen measures 5 3/8" x almost 4" x over 3 1/2".  This very interesting piece comes from Missouri and would complete any serious collection.

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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.

Dolomite is a sedimentary carbonate rock and a mineral which is composed of Calcium and Magnesium.  It is sometime referred to as Dolostone or Dolomitic Limestone.  It is used as an ornamental stone, as raw material for the manufacture of cement, added to soil to lower acid levels and as a nutritional supplement.

qtz dolomite calcite

Quartz, Dolomite and Calcite

$16.00 M204b   Here is a nice specimen of Fluorite from China.  It has a beautiful range of Dark Purple to lighter Purple Fluorite crystals with a small clear Calcite crystal in the center of the specimen.  It measures 1 1/2" x almost 1 7/8" x over 1 1/4".   It has some dings in it but is still absolutely amazing.

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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.

fluorite

Fluorite

$45.00 M201c  Here is a something very different; a nice specimen of Chabazite in matrix from Table Mountain, Colorado.  This specimen we purchased from an old collection has several shaded Peach colored Chabazite in the sparkly cavities.  It measures over 3 3/8" x 2 7/8" x nearly 2 1/4" and has a very unique, natural exterior. An interesting, one of a kind specimen for your mineral collection.

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Chabazite, also known as acadialite, is one of the lesser known Zeolites. Chabazite forms in the petrified bubbles (called vesicles) of volcanic rocks that have had a slight amount metamorphism. Chabazite occurs also in and around hot springs as a precipitate but does not form the wonderful crystals that collectors know from such places as Poona, India. The typical crystal of chabazite is a rhombohedron. A rhombohedron is basically a "squashed" cube. Chabazite occurs most commonly in voids and amygdules in basaltic rocks.

mineral

Chabazite

$35.00

M214b   Here is a rather unique find at the Rock Shed.  This is a high quality specimen of rough Hematite.  It measures 3 1/8" x 2 1/2" x nearly 1 3/4" and has its own natural shine in areas.  This mineral has an unique bubbly, botryoidal design and rich color.

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Hematite is a mineral form of Iron oxide.  It is a very common material that has a black to steel to silver-grey color and may also appear reddish brown.  Hematite is a heavy metal and when it is polished it is consider to many to be of gemstone quality.  It is very popular in jewelry and Native American art.

hematite

Hematite

$30.00 M205c    A nice specimen of natural Copper in Quartz from Adams County, Pennsylvania. It is the natural native copper just as it formed in the rock.  It measures almost 4 3/8" x 3 3/8" x 1 1/4", weighs just under a pound and has a natural unpolished exterior to show the lovely dark copper color.

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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.

copper

Natural Copper

$15.00 M209b   Here is a very nice combination mineral of Dolomite and Quartz Crystals.  This material is from India.  It measures 3 1/4" x over 2" x nearly 1 1/4" and has a natural sparkly finish.  This beauty is a one of a kind, very well defined specimen that will not be duplicated.

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.

Dolomite is a sedimentary carbonate rock and a mineral which is composed of Calcium and Magnesium.  It is sometime referred to as Dolostone or Dolomitic Limestone.  It is used as an ornamental stone, as raw material for the manufacture of cement, added to soil to lower acid levels and as a nutritional supplement.

dolomite crystal quartz

Dolomite-Quartz

$45.00

M206c   This is a very nice Galena specimen with lots of character and design. It measures nearly 2 3/4" x over 1 7/8" x almost 1 3/8" and has a natural shiny appearance.  The Galena has Calcite crystals on it as well.  The mineral is quite heavy for it's size as it falls into the heavy metal category of minerals. This very cool specimen weighs almost 3/4 pounds.

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

galena

Galena

$35.00

M212b   This is a very nice Rhodocrosite specimen.  It measures almost 2 3/4" x 1 1/2" x nearly 1 3/8" and has good character.  The Rhodocrosite has a highly polished appearance on portions to show the lovely Pink colors inside.  A great specimen of a hard find material.

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Rhodocrosite is a Manganese Carbonate mineral.  It is typically a rose-red color, but impure specimens can be shades of pink to pale brown.  It is used as a key component of low-cost stainless steel and certain Aluminum alloys.  Quality banded specimens are often used for decorative stones and jewelry, although it is relatively soft and difficult to cut.

rhodocrosite

Rhodocrosite

$75.00

M202c   Here is some very different;  a nice specimen of Titanium coated Quartz crystals.  In an interesting fusion of science and nature using a process called magnetron ionization, a brilliant iridescent titanium coating covers the lovely Quartz producing a spectacular piece.  The shiny multi-colored specimen measures 3 7/8" x 3" x over 1 1/2".  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.

mineral

Titanium Quartz

$24.00 M203b  This is a beautiful specimen with bright yellow Sulfur crystals.  It measures nearly 3 1/4" x 2 3/8" x 1 1/2" 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.

mineral

Sulfur

$24.00 M211b  Here is a very nice Dog Tooth Calcite Crystal.  It measures over 3 1/2" x nearly 2 1/2" x 2 1/8" and has a naturally smooth 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 the edge that provide 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.

dog tooth calcite

Dog Tooth Calcite

$15.00 M207c  This nicely polished Septarian Slab is from Utah.  It measures 5 5/8" x nearly 33/4" x 3/8" thick and has been polished on the front face.  This Septarian Nodule slab has beautiful Yellow Calcite bordered with pretty brown Aragonite.  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.

septarian

Septarian Slab


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