mineral

Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Milky white to light tan/yellow; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on the Mohs scale
Color: Milky white to light tan/yellow
Luster: Vitreous (glassy) to greasy

Identified June 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily through the cooling of silica-rich magma or from hydrothermal veins. It is one of the most abundant minerals on Earth and can be found in rocks from almost every geological age.

Uses & applications

Extensively used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, construction aggregates, and semi-precious jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is chemically very stable and resistant to weathering, which is why it often remains as sand after other minerals have eroded away.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), lack of cleavage, and glassy appearance. It is found globally in riverbeds, mountains, and beaches.