mineral
Quartz Vein Rock
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white to gray in color with a vitreous to greasy luster. Hexagonal crystal system (often cryptocrystalline or massive in veins), lacking true cleavage and displaying conchoidal fracture. Specific gravity is approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray in color with a vitreous to greasy luster. Hexagonal crystal system (often cryptocrystalline or massive in veins), lacking true cleavage and displaying conchoidal fracture. Specific gravity is approximately 2.65.
Formation & geological history
Formed via hydrothermal precipitation where hot, mineral-rich fluids circulate through fractures in Earth's crust, cooling and depositing silica over various geological eras.
Uses & applications
Commonly used in glassmaking, electronics (as oscillators), abrasives, ornamental items, and gemstone collections.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and exhibits piezoelectric properties, generating an electric charge under mechanical stress.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found worldwide in hydrothermal veins, pegmatites, and sedimentary deposits. Collectors look for well-formed crystal points or interesting matrix structures.
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