biyotit (siyah mika minerali)

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biotite
A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron
or black mica Silicate mineral in the common mica group. It is abundant in metamorphic rocks, in pegmatites, and in granites and other igneous rocks. Biotite is a layer silicate structure in which aluminum and silicon occur in infinitely extending Si-Al-O sheets that alternate with potassium-rich and magnesium-(and iron-) containing sheets
{i} mineral in the mica group
dark brown to black mica found in igneous and metamorphic rock
Mica containing iron and magnesia, generally of a black or dark green color; a common constituent of crystalline rocks