mineral group
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
Hardness: 7 (Quartz) and 2-2.5 (Mica); Color: White, grayish, or colorless with silvery flashes; Luster: Vitreous to pearly; Crystal structure: Trigonal/Monoclinic; Cleavage: None in quartz, perfect basal in mica.
- Hardness
- 7 (Quartz) and 2-2
- Color
- White, grayish, or colorless with silvery flashes
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 7 (Quartz) and 2-2.5 (Mica); Color: White, grayish, or colorless with silvery flashes; Luster: Vitreous to pearly; Crystal structure: Trigonal/Monoclinic; Cleavage: None in quartz, perfect basal in mica.
Formation & geological history
Typically forms in felsic igneous rocks like granite or in metamorphic rocks like schist through cooling magma or high-pressure alteration of clay minerals.
Uses & applications
Industrial use in glassmaking and electronics (quartz) and as an insulator or shimmer agent in cosmetics (mica). Often kept as educational specimens.
Geological facts
Muscovite was once used as a glass alternative in windows in medieval Russia, leading to the name 'Muscovy glass'. Quartz is the second most abundant mineral in Earth's continental crust.
Field identification & locations
Identify by looking for glassy, hard white masses (quartz) containing thin, shiny, silvery flakes that can be peeled with a fingernail (mica). Common in mountainous/granitic regions.
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