Minerals from Different Locations

Page 6

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Kyanite is a typically blue Silicate mineral that is commonly found in Aluminum rich metamorphic pegmatites and/or sedimentary rock.  It is used primarily in refractory and ceramic products including porcelain plumbing fixtures and dinnerware.  It is also used in electrical insulators and abrasives.  It is definitely a collector's mineral.

Kyanite

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Aragonite is a Carbonate mineral that can occur in conjunction with Calcium Carbonates.  Aragonite differs from Calcite in the formation of the Crystal shapes which can be in lattice, crystal, columnar or fibrous in many different designs, shapes and sizes.  Aragonite will form in mollusk shells, oceans and salt water caves as inorganic precipitates called marine cements and speleotherms.  Ammolite is a form of Aragonite with impurities that make it iridescent and valuable as a gemstone.

Aragonite

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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.

Amethyst

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Azurite is a mineral belonging to the Carbonate group of minerals.  It is commonly found with Malachite, Goethite and Calcite.  It is typically associated with Copper deposits including Limestone which is the source of the Carbonate.

 Azurite

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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.

Smithsonite

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.

 Pyrite-Quartz

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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

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Apatite is a part of the phosphate group of minerals that was formed in igneous rocks and in metamorphosed limestone.  Apatite is translucent or transparent and usually green in color but can be colorless, white, yellow, bluish, reddish, brown or purple. 

Apatite

M613b  Here is a smaller specimen of Hemimorphite from Mexico.  This mineral measures 5" x 3 1/2" x 2" and has nice sparkly crystals covering much of the entire specimen.  A very nice, very different mineral for your collection.

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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.

Hemimorphite

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Aragonite is a Carbonate mineral that can occur in conjunction with Calcium Carbonates.  Aragonite differs from Calcite in the formation of the Crystal shapes which can be in lattice, crystal, columnar or fibrous in many different designs, shapes and sizes.  Aragonite will form in mollusk shells, oceans and salt water caves as inorganic precipitates called marine cements and speleotherms.  Ammolite is a form of Aragonite with impurities that make it iridescent and valuable as a gemstone.

Aragonite

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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.

Malachite

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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

Azurite is a mineral belonging to the Carbonate group of minerals.  It is commonly found with Malachite, Goethite and Calcite.  It is typically associated with Copper deposits including Limestone which is the source of the Carbonate.

Azurite Nodule

M610c  Here is a very nice specimen of Vanadinite on matrix.  This mineral is from Morocco.  It measures 3" x 2 1/4" x 1" and has many hexagonal Vanadinite crystals.  This is a beautiful work of nature and very fragile.

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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.

Vanadinite

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Okenite is part of the Calcium Silicate family and is an unusual mineral.  It frequently appears as a cotton-ball cluster with other minerals in matrix.  The color is usually white but may have a yellow or blue tint.  Okenite has very slender long, thread like fibers that make up a spherical or rounded aggregate.  The Okenite clusters may bring out the urge to touch the fine fibers and to test its softness.  We suggest refraining from this as the crystals are very delicate and once touched, they are never the same again.

Phrenite is a mineral from the Calcium Aluminum Silicate group.  It can be found in shades of green, yellow or brown as well as white.  Some specimens are gem quality and make beautiful jewelry.  It is found world wide but most notable deposits are found in Australia, South Africa, Germany and the United States.

Okenite-Phrenite

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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

M612b   This is a nice, natural native copper which has been mostly removed from the matrix rock which was surrounding it. The white quartz matrix is visible in many areas.  It measures 3 3/8" x 2 1/4" x 1 1/8" 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. 

Copper

M608b  Here is something really different for you mineral collection!!  This is a very nice, above average quality Pyrite Sun.  It measures 3" x nearly 3" x 1/4" and has a natural, shiny appearance.  This beauty was found in the coal mines of Illinois and are surrounded by Black shale and coal.  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. 

Pyrite Sun

M611b  This is a very nice, above average quality Smokey Quartz specimen.  It measures over 3 3/4" x 3 1/2" x 1 1/4" 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