mineral
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
AI-generated identification · may be incorrectHardness: 2-2.5 on Mohs scale (mica) and 7 (quartz); Color: Silvery-white to pale tan; Luster: Pearly to metallic; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific Gravity: 2.76-3.0
- Hardness
- 2-2
- Color
- Silvery-white to pale tan
- Luster
- Pearly to metallic
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Physical properties
Hardness: 2-2.5 on Mohs scale (mica) and 7 (quartz); Color: Silvery-white to pale tan; Luster: Pearly to metallic; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific Gravity: 2.76-3.0
Formation & geological history
Formed in igneous environments (pegmatites and granites) or metamorphic environments (schists and gneises). This specimen appears to be from a pegmatite where slow cooling allowed for large crystal formation.
Uses & applications
Used as an electrical insulator in capacitors/transistors, in heat-resistant windows (isnglass), as a filler in paints and plastics, and in cosmetics (glitter/shimmer).
Geological facts
Muscovite was historically used for window panes in Russia (the 'Muscovy region'), leading to its name. It is highly resistant to heat and chemicals, making it a critical industrial material.
Field identification & locations
Identify by its 'book' like structure that can be peeled into paper-thin, transparent sheets with a fingernail. Commonly found in mountainous regions with high metamorphic or granitic activity.
