mineral group

Quartz with Muscovite Mica

SiO2 with KAl2(AlSi3O10)(OH)2

AI-generated identification · may be incorrect

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

Identified May 10, 2026More mineral group →

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Physical properties

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.

Other mineral group specimens

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Sodalite

Sodalite (Na8Al6Si6O24Cl2)

mineral

Sodalite

Na8(Al6Si6O24)Cl2

mineral

Feldspar (specifically Orthoclase)

Potassium aluminum silicate (KAlSi3O8)

mineral

Likely garnet gemstone

Garnet-group silicate; species cannot be determined from the photo (common red varieties include almandine, Fe₃Al₂(SiO₄)₃, and pyrope, Mg₃Al₂(SiO₄)₃).

gemstone

Feldspar

Potassium Feldspar (KAlSi3O8)

mineral

Red garnet cabochon pendant

Likely almandine garnet, iron-rich garnet-group silicate (often approximated as Fe₃Al₂(SiO₄)₃); identification from the image is uncertain.

gemstone