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Mica
Micas are a group of silicate 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.
Colors It Comes In -
Muscovite: A light-colored mica that can range from colorless to greenish, blue-green, emerald-green, pinkish, brownish, or cinnamon-tan
Biotite: A black to dark brown mica that can also be red, red-brown, greenish brown, or blue-green
Lepidolite: A lavender-colored mica that is rich in lithium
Phlogopite: A yellowish-brown or green white mica
Margarite: A pale pink, green, or yellow mica that is also known as calcium or lime mica
Fuxite: A green mica
Fracture Pattern - flaky
Shape - pseudohexagonal
Luster - pearly, vitreous
Texture - layered or platy, plastic like
Where It Can Be Found - The world's chief deposits of mica are found in India at Bihar and in the Nellore district of Madras. Over 50% of the mica used today comes from these two regions. Other major producers are Belgium, Brazil and China. In industry, all types of mica are used in two different ways.
Hardness On The Mohs Scale - 2.5 To 3 Out Of 10
