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Mica on Calcite (15)

$40.00

This listing is for the exact specimen pictured. 

Weight:  5.09 lbs 

WHAT IS IT

Micas are a group of minerals whose outstanding physical characteristic is that individual mica crystals can easily be split into extremely thin elastic plates. Mica is common in igneous and metamorphic rock and is occasionally found as small flakes in sedimentary rock.

Micas are used in a variety of products ranging from drywalls, paints, fillers, especially in parts for automobiles, roofing and shingles, electronics etc. The mineral is also used in cosmetics to add "shimmer" or "frost."

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3).

Over 800 forms of calcite crystals have been identified. Most common are scalenohedra.

Calcite is a common constituent of sedimentary rocks, limestone in particular, much of which is formed from the shells of dead marine organisms. Approximately 10% of sedimentary rock is limestone. It is the primary mineral in metamorphic marble. It also occurs in deposits from hot springs as a vein mineral; in caverns as stalactites and stalagmites; and in volcanic or mantle-derived rocks such as carbonatites, kimberlites, or rarely in peridotites.

Ancient Egyptians carved many items out of calcite, relating it to their goddess Bast, whose name contributed to the term alabaster because of the close association. Many other cultures have used the material for similar carved objects and applications.

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