mineral

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Colorless to white-milky; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Colorless to white-milky
Luster: Vitreous (glassy)

Identified March 10, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Colorless to white-milky; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms in igneous, metamorphic, and sedimentary environments. Typically crystallizes from magma or precipitates from hydrothermal veins. It is found in geological formations ranging from billions of years old to relatively recent deposits.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, jewelry (semi-precious gemstone), and as a landscape/construction aggregate.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it's the primary component of beach sand.

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage. It is found globally, particularly in granite outcrops or as river pebbles. Collectors look for well-defined hexagonal crystal points or transparency.