mineral
Quartz with Mica inclusions
Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions
Hardness: 7 (Mohs scale), Color: Smoky grey to translucent white, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Smoky grey to translucent white, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed through the cooling and crystallization of silica-rich magma or from hydrothermal veins. Often found in pegmatites and metamorphic environments.
Uses & applications
Used widely in making electronics (piezoelectric properties), glass manufacturing, abrasives, and as decorative collector specimens.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. When it contains inclusions of mica, it can exhibit a sparkling effect known as aventurescence or simply appear as flaky metallic specks.
Field identification & locations
Identify in the field by its hardness (it can scratch glass), lack of cleavage, and glassy appearance. Common in granite-rich terrains and riverbeds worldwide.
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