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The chemical formula of mineral Copiapite is indicated by (Fe, Mg)Fe4(SO4)6(OH)2 – 20H2O or Hydrated Iron Magnesium Sulfate Hydroxide. Copiapite is actually a Sulfate mineral. The name Copiapite was actually derived from the famous mineral locality called Copiapo, Chile. This mineral species was actually first discovered in this famous locality in the year 1833. Copiapite is also thought to lend its name from mineral group that comprises similar triclinic, hydrated iron sulfate minerals. This group is called the Copiapite Group of minerals. The members of this mineral group are all distinct minerals, although they are not really named in any creative ways. This mineral species is also sometimes known as yellow copperas. Copiapite is known to crystallize in the triclinic crystal system of crystal formation. In optical mineralogy, this crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another.

 

            Copiapite is commonly used as mineral specimens that are commonly found exhibiting nice and splendid images under polarizing light microscope used in optical mineralogy. Copiapite is considerably very hard to distinguish from other similar hydrated iron sulfate minerals if evaluated without the X ray studies. But if the distinction is made between Copiapite and the yellow encrusted uranium minerals, it can be done very easily. Copiapite has paler color than the yellow encrusted uranium minerals. Copiapite mineral is also found not radioactive and not fluorescent in ultra violet light. Copiapite mineral specimens can be found as rather attractive piece of material under polarized light microscope but they can actually lose water and are therefore advised to be stored in a sealed or closed containers.

 

            Copiapite is most commonly found in shades of yellow, orange, sulfur yellow, golden yellow, greenish yellow to ocher when evaluated under petrographic polarizing light microscopes used in optical mineralogy. Copiapite is most commonly found exhibiting pearly to dull luster when it is viewed in reflected light of petrographic polarizing microscope. Copiapite is usually found showing perfect cleavage in only one direction when mineral specimens are evaluated between crossed nicols of polarizing microscopes for mineralogists. Copiapite also exhibits uneven fracture when it is examined under several adjustments on the aperture diaphragm of the polarized microscope used in optical mineralogy. The specific gravity measure of the mineral Copiapite usually gives an approximate value of 2.1 grams per centimeter cube, which is considered light even for translucent minerals. The hardness measure of the mineral Copiapite when it is evaluated using the Mohs scale method is usually found ranging from 3.0 to 3.5. Copiapite is most commonly found leaving a pale yellow streak when specimens are rubbed on a white porcelain streak plate.

 

            Copiapite crystals are commonly found translucent to opaque in appearance. The crystal habit of mineral Copiapite as described in optical mineralogy usually includes aggregates of small platy or scaly masses, which can be splendidly exhibited under polarizing light microscopes. Copiapite minerals can be also found as encrustrations and granular masses that often produce nice and interesting microscope images under polarized microscope. Copiapite mineral in individual crystals are considerably rare in occurrence. Some Copiapite mineral crystals are also fragile. Mineral Copiapite is a known biaxial figure when evaluated under petrographic polarizing light microscope. The refractive indices are commonly found ranging from 1.506 to 1.600 that can be clearly exhibited under polarized light microscopes. The maximum birefringence of the mineral Copiapite, which can be found exhibited under polarizing light microscope is usually 0.069. Mineral Copiapite is soluble in water. It has a metallic taste but it is considered as a not fluorescent mineral. Mineral specimen Copiapite can be commonly found showing low surface relief when viewed under petrographic polarizing microscope used in optical mineralogy. It has no dispersion found when evaluated in transmitted light of polarizing microscopes for mineralogists. This mineral Copiapite is found as a non-pleochroic mineral when viewed under polarized light microscopes used in optical mineralogy. Copiapite is a magnetic mineral species. There is no specific data on the toxicity and health dangers for this mineral Copiapite. However, the specimens of this mineral should be treated with great care and use of sensible precaution is advised upon handling them. Mineral Copiapite is also a not radioactive mineral, which is found after several chemical evaluations.

 

Copiapite mineral is commonly associated with several other interesting minerals including pyrite and other iron sulfides and also other secondary minerals. The best field indicators of mineral Copiapite usually include color, solubility, density, taste and its not fluorescent property. Copiapite is actually a secondary mineral, which forms from the oxidation of iron sulfide deposits. Mineral Copiapite forms in the weathering or oxidation zones of sulfide deposits that are often found in arid climates. Mineral Copiapite notably occurs at some famous mineral localities such as the Copiapo in Atacama, Chile and some areas in the United States like Nevada, Utah and California. Copiapite minerals can be also found from other famous mineral localities like Germany, France, and Spain.



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Monday, December 29th, 2008 at 6:33 am
Category:
The Sulfates Mineral Class
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