RockVault
Mica

Mica

Image: <p>Luis Miguel Bugallo Sánchez (<a href="//commons.wikimedia.org/wiki/User:Lmbuga" title="User:Lmbuga">Lmbuga Commons</a>)(<a href="https://en.wikipedia.org/wiki/gl:User:Lmbuga" class="extiw" title="w:gl:User:Lmbuga">Lmbuga Galipedia</a>) </p> <dl><dd>Publicada por/<i>Publish by</i>: Luis Miguel Bugallo Sánchez</dd></dl> (CC BY-SA 3.0)

Mineral NameMica
Chemical FormulaKAl₂(AlSi₃O₁₀)(OH)₂
Mohs Hardness2
Crystal Systemmonoclinic
Lustervitreous
Streak Colorwhite
Cleavageperfect basal in one direction
Fractureuneven
Specific Gravity2.8
Colorssilver, pale green, light brown, colorless
Transparencytransparent
Type LocalityWorldwide, common in pegmatites and metamorphic rocks
Mineral GroupSilicates
Useselectrical insulation, filler in paints and plastics, lubricant, decorative material
Associated Mineralsquartz, feldspar, garnet, tourmaline
Raritycommon

Description

The image displays a large, blocky specimen of mica, characterized by its distinct platy, layered structure and a silvery-greenish luster. Its characteristic perfect basal cleavage is evident from the visible, reflective sheets.

Geological Context

Mica minerals, such as muscovite, are common rock-forming minerals found in a wide range of igneous rocks like granites and pegmatites, and metamorphic rocks like schists and gneisses, forming under various pressure and temperature conditions.

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