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The chemical formula of mineral Pyroaurite is indicated by Mg6Fe2CO3(OH)16 – 4H2O or Hydrated Magnesium Iron Carbonate Hydroxide. Pyroaurite is actually a Carbonate mineral. It is most commonly used as mineral specimen and is often found exhibiting nice and interesting appearance when viewed with the aid of petrographic polarizing light microscope. Mineral Pyroaurite is a rare mineral that comes mostly from the famous mines of Langban, Varmland, Sweden. But it is also found at a few other localities. Pyroaurite forms platy to tabular crystals. Crystals of Pyroaurite can yield flashes of yellow and it is this display that is responsible for its name. Pyroaurite, when loosely translated means golden fire. Pyroaurite is dimorphous with the mineral sjogrenite. In optical mineralogy, dimorphs are minerals that share the same chemistry but have different structures.

 

            Mineral Pyroaurite is usually found brownish yellow, reddish brown, yellow, white and greenish brown which can be more splendidly wonderful when viewed with the aid of polarized microscopes. Pyroaurite is most commonly found exhibiting vitreous to pearly luster when viewed in reflected light of polarized microscope used in optical mineralogy. Pyroaurite is known to crystallize in the trigonal system. Most crystals of mineral Pyroaurite are usually found translucent to transparent in appearance. The crystal habit of mineral Pyroaurite as described in optical mineralogy usually includes tabular, scaley to platy crystals and it can be also found in fibrous forms which can be seen more fascinatingly wonderful when viewed with the aid of polarized microscopes. Mineral Pyroaurite is usually found with perfect basal cleavage when viewed with the aid of polarizing microscopes. The hardness measure of mineral Pyroaurite when it is evaluated using the Mohs scale method is usually 2.5. Pyroaurite is most commonly found leaving a white streak when specimen is rubbed on a white porcelain streak plate. The specific gravity measure of mineral Pyroaurite is usually found 2.1, which is considered very light. Mineral Pyroaurite is most commonly found associated with other interesting minerals such as hydromagnesite, calcite, magnetite, lizardite, stitchite, reevesite, and sjogrenite. The best field indicators of mineral Pyroaurite usually include crystal habit, color, cleavage, and locality. Pyroaurite notably occurs at several localities including Sweden, Austria, Australia, some areas in USA, Scotland, and Canada.



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Monday, June 1st, 2009 at 4:14 am
Category:
The Carbonates and Borates Mineral Class
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