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The chemical formula of mineral Calaverite is indicated by AuTe2 or Gold Telluride. Calaverite is actually a Sulfide mineral. Calaverite was actually first discovered in the year 1861 at the Stanislaus Mine in Calaveras County, California. It was actually named Calaverite after its famous locality, the Calaveras County, California in the United States. Calaverite minerals are commonly found as very interesting and wonderful sulfide mineral, which are usually exhibiting fascinating and majestic microscope images under geological microscopes. Calaverite is known to crystallize in the monoclinic system, which can be seen clearly when specimen is evaluated with the aid of polarized light microscope for mineralogists. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis.

 

            Calaverite is considered as a very minor ore of gold, beside the native gold, and also of tellurium. It is commonly used as a mineral specimen and is usually found displaying interesting microscope images when viewed under a petrographic polarizing light microscope. Calaverite is actually considered as the most sought after mineral by most mineral collectors. This remains true despite the fact that Calaverite minerals are considerably uncommon. Calaverite, besides native gold, is considered as the most common gold bearing mineral. The element gold can be found as trace amounts in a few minerals. Gold is actually uncommonly found as a significant part of a non-alloyed mineral. But Calaverite is indeed considered as a unique mineral since it is commonly found as an actual significant part of some minerals that are non-alloyed. Calaverite can be also found as a native gold in its elemental state and also as an alloy with other useful metals such as copper and silver, both of which are found exhibiting a nice and splendid microscope image under a polarizing light microscopes.

 

            Gold, for some reasons are found with affinity for the element tellurium. Tellurium is sometimes found naturally as native tellurium. Tellurium has some properties of metals but not all and not as strong. These properties imply that tellurium is classified as a semi-metallic element. This actually helps to provide further explanation for the attraction of several metals like silver and gold to tellurium. There are several other gold tellurides that are found. These are kostovite, nagyagite, sylvanite, petzite and krennerite. Calaverite has close relation to another gold telluride called sylvanite, a silver gold telluride. Calaverite and sylvanite differ only in their silver content. They are also found with slight difference in cleavage, hardness, density and color. But most of the time, these two minerals are only distinguishable from one another through several chemical tests.

 

            Calaverite crystals are considerably unique. These Calaverite minerals are also of interest to most serious mineral collectors. Calaverite mineral crystals are commonly found forming striated prisms when they are evaluated under a petrographic polarizing light microscope. These crystals can be actually twinned commonly causing sharp bends that are usually clearly visible when viewed with the aid of petrographic polarizing microscopes. These may also cause reticulated individual crystals and also skeletal or arborescent formations. These clusters of crystals actually remind many serious mineral collectors of writing. Calaverite is also known as a member of the Krennite Group of Sulfides. Calaverite is also sometimes considered as perhaps a structurally altered form of krennite.

 

            Calaverite is commonly found in silver white color to brassy yellow in reflected light of petrographic polarizing microscope. Specimens of Calaverite mineral are commonly found exhibiting bright metallic luster when viewed in reflected light of polarized microscope used in optical mineralogy. Calaverite is usually found having an absent cleavage when mineral specimens are evaluated between crossed nicols of polarizing light microscope for mineralogists. The fracture that is most commonly found exhibited by Calaverite specimens under several adjustments on the aperture diaphragm of polarized microscope for geologist is usually conchoidal. The specific gravity measure of mineral Calaverite usually gives an approximate value ranging from 9.1 grams per cubic centimeters to 9.3 9.1 grams per cubic centimeters, which is considered heavy even for metallic minerals. The hardness measure for Calaverite when it is evaluated using the Mohs scale method is usually found ranging from 2.5 to 3. Calaverite is most commonly found leaving a yellow gray streak when these specimens are rubbed on a white porcelain streak plate.

 

            Calaverite crystals are commonly found opaque in appearance. The crystal habit that is often found exhibited by mineral Calaverite as described in the field of optical mineralogy usually includes prismatic to more rarely tabular crystals. These crystals are often found twinned when examined with the aid of petrographic polarizing light microscopes used in optical mineralogy. These twinned crystals are actually twinned into sharp bends and are commonly found as reticulated individual and skeletal or aborescent formations. These habits actually looks like writing when described. Calaverite minerals are also sometimes found as granular masses. Calaverite mineral crystals tend to be deeply striated, which are commonly found parallel to the prominent length when the specimens are evaluated under a polarized light microscope for mineralogists. Generally, Calaverite minerals contain some silver replacing gold. They can be dissolved in concentrated sulfuric acid. When the mineral is dissolved in a hot sulfuric acid, it is commonly found leaving a spongy mass of gold in a red solution of tellurium. There is no specific data on the toxicity and health dangers for mineral Calaverite. However, mineral specimen Calaverite should be treated with great care and use of sensible precaution is advised upon handling them.

 

            Calaverite minerals are commonly associated with several other interesting minerals such as quartz, gold, fluorite, sylvanite, celestite, nagyanite, pyrite, krennerite and other rare telluride minerals. The best field indicators of Calaverite minerals commonly include color, density, crystal habit, softness, lack of cleavage and its wonderful association with several other telluride minerals and gold. Calaverite minerals are most commonly found in low temperature veins. Calaverite minerals notably occur at some types of localities including the Cripple Creek, Teller County in Colorado and also the Calaveras County, California in the United States, where the mineral species derived its name. Calaverite minerals can be also found at Nagyag, Romania as well as in Kalgoorlie in Australia and also in some areas in Canada including the Kirkland Lake Gold District in Ontario and Rouyn District in Quebec.



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Monday, December 29th, 2008 at 6:24 am
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The Sulfides Mineral Class
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