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Cost
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Item
Description
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Click Picture
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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. Another photo.
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.
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Goethite
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$24.00 |
M218b
This is an interesting mineral combination! Here is an Apophyllite-Stilbite
mix. This fantastic mineral measures 4 5/8" x 3 1/2" x 1 3/4" and has a super
sparkly appearance. A great way to begin your mineral collection with
a smaller collection all in one!! This material is from Mahad, India.
Another photo.
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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Apophyllite-Stilbite
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$14.00 |
M216c
Here is an interesting find. This is a very nice
specimen of Stibnite from China. It measures 2 3/8" x 1" x
1" and
has a sparkly Grey metallic color. This is an interesting specimen that
has areas of Yellow Calcite and an unique appearance.
Another photo.
Stibnite, also known as Antimonite, is a Sulfide mineral that forms
grey Crystals. It is the most important source for the rare Metalloid
Antimony. It is used in the manufacture of fireworks, batteries, safety
matches and mascara.
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Stibnite
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$18.00 |
M252c
This is a nice specimen of natural, native Copper from Keweenaw Peninsula,
Michigan. This nugget specimen was rescued after a short time in a
grinding mill. It measures 2 1/2" x 1 3/8" x 1/2" and has a smooth
exterior. Another photo.
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.
Click
here to view more Native Copper specimens
!!
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Native Copper
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$20.00 |
M208c
Here is a very interesting specimen of Black Tourmaline from
Brazil. It measures 2 1/8" x 1 7/8" x 1 3/4" and a semi-shiny finish.
It has a very unique shape and design. 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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Tourmaline
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$15.00 |
M213c
Here is a very nice interesting specimen of Dolomite resting in a bed of
Crystal Quartz. It measures 2" x 2 3/4" x 1" and has a natural texture
and finish. This mineral has several well defined sparkly-opaque, Dolomite
Crystals with of shiny, sparkly Gold Pyrite accents. This material is
from Shangbao near Leiyang Hunan Province, China. 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.
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Dolomite-Pyrite-Quartz
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$18.00 |
M201b
This is a combination mineral of nicely formed Galena
crystals with Quartz and Chalcopyrite. It
measures 2 1/4" x 2 1/4" x 1 1/2" in depth and has a nice metallic luster.
From the Tri State, Joplin, Missouri Area, A great addition to any mineral collection. 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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Galena
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$16.00 |
M215c
A nice specimen of natural Copper from Keweenaw Peninsula, Michigan. This
freeform was originally in a mineral based matrix that was chipped away to
reveal the beautiful Copper mineral. It measures 3 1/2" x 2 1/2" x 1" with a
natural sheen. Another photo.
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 Free Form
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$15.00 |
M204b
Here is a nice specimen of natural Chalcocite, Covellite and Pyrite from
the Leonard Mine (now closed) in Butte, Montana. It measures 3 3/4"
x 2 1/8" x 2 1/2". A really neat mineral to add to your collection.
Chalcocite is an important Copper Ore mineral. It is opaque with
a metallic luster. It is usually dark gray to black in color.
It has been mined for years and is one of the most profitable of the Copper
Ores.
Covellite is a crystalline form of Copper Sulfide and usually has an
enchanting indigo blue color. It is commonly found with and as a coating
on Chalcocite, Chalcopyrite, Bornite, Enargite and Pyrite.
Pyrite is an Iron sulfide with an isometric structure. 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.
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Chalcocite-Covellite-Pyrite
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$10.00 |
M202b
Here is some very nice, smaller sized pieces of Peacock Copper Ore.
Each piece measures approximately 3/4" to 1 1/2" in size with the total approximate
weight of 1/2 lb. We offer a good variety of color,
size and design. Unfortunately, there is NO choice in specimens as we
bag the pieces up straight from the box. The set would make a great
educational tool for scouts or schools. Items will be similar to items
in photo. You will receive ten (10) pieces of our choosing.
Peacock Copper Ore is a Copper Iron mineral that is closely related
to Bornite and Chalcopyrite. Although it is sometimes confused with
Pyrite, Peacock Copper is a mixture of Copper and Iron whereas Pyrite is an
Iron derivative.
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Peacock Copper Ore
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$20.00 |
M214b Here is
a rather unique find at the Rock Shed. This is a high quality specimen
of rough Hematite. It measures 3 1/2" x 3" x 2" and has its own natural
shine. This mineral has an unique bubbly, botryoidal design and rich
color on both sides.
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.
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Hematite
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$48.00 |
M210c This
is a very nice, above average quality Smokey Quartz specimen. It measures
4 3/4" x 3" x 3 1/2" 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.
Another photo.
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
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$9.50 |
M205c
Here are 3 Copper nuggets from Keweenaw
Peninsula, Michigan. They were rescued after a short time in a grinding
mill. The nuggets measure approximately 1 1/4" x 1" x 1/2" with a nice
natural polished appearance. This item will be similar to what is pictured.
Makes a great gift or educational tool. 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 Nuggets
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$35.00 |
M209c
Here is a very nice, above average quality, combination mineral that
includes Pyrite, Dolomite, Galena and Quartz Crystals. This material
is from Peru. It measures 3" x 2 1/2" x 2" and has a natural sparkly
finish. This beauty is a one of a kind, very well defined specimen that
will not be duplicated. Another photo.
Another photo.
Pyrite is an Iron sulfide with an isometric structure. 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.
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.
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Pyrite-Dolomite-Quartz-Galena
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$20.00 |
M206b
This is a very nice, large
Galena specimen. It measures 2 3/4" x 2 1/4" x 1 1/2" and has a natural
shiny appearance. The mineral is quite heavy as it falls into the heavy
metal category of minerals. It has a nice character and design.
Another photo.
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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Galena
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$70.00 |
M203b
Here is something different from the Mineral department at the Rock Shed.
This is a larger, above average quality Ferro-Columbite specimen from the
Etta Mine in Keystone, South Dakota. It measures 3 3/4" x 2" x 1 1/2"
and has a natural rough exterior. This mineral has a secondary Soda-Spar
mineral attached on several places. This is one of our rarer minerals
we have on hand, so if it sparks your interest, you will definitely have a
one-of-a-kind mineral. Ferro-Columbite, also known as Niobite or
Niobite-Tantalite, is a black mineral that is an ore of Niobium and Tantalum.
It has a sub-metallic luster and a high specific gravity. It is a Niobate
of Iron and Manganese which contains Tantalate of Iron. It is used for
heat resistance.
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Ferro-Columbite
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$50.00 |
M211c
Here is a very nice Gold colored Dog Tooth Calcite Crystal. It measures
9 1/2" x 7" x 2 3/4" and has a naturally smooth exterior. This specimen
has an almost translucent Crystal points with dark Red pyramid-shaped centers
and an iridescent shine. A super gift.
Another photo.
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
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$70.00 |
M207b
This is an above average, nicely polished Septarian End Cut from
Utah. It measures 7 1/2" x 7" 1/2"x 3" and has been polished on the front
face. This Septarian Nodule has beautiful Golden Yellow Calcite
bordered with pretty brown Aragonite. A definite beauty to behold.
Photo of the Back.
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 End
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