mineral

Quartz (Milky/Common variety)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Translucent to opaque white/tan
Luster: Vitreous (glassy) to greasy

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. It can be found in a wide variety of geological ages, from ancient Precambrian shields to relatively modern volcanic deposits.

Uses & applications

Used in the manufacture of glass, ceramics, and electronics (due to piezoelectric properties). Lower-grade specimens are used in construction as aggregate or in landscaping. Polished stones are popular for jewelry and collecting.

Geological facts

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

Field identification & locations

Identify in the field by its ability to scratch glass and its lack of cleavage/tendency to break in curved 'conchoidal' patterns. Commonly found in riverbeds, mountains, and as veins within granite or schist. It will not react with acid.

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