Quartz (Milky/Crystalline variety)

Physical Properties

Hardness: 7 on the Mohs scale. Color: White to colorless. Luster: Vitreous (glassy). Crystal Structure: Trigonal/Hexagonal. Cleavage: Indistinct (conchoidal fracture). Specific Gravity: 2.65.

Formation & Geological History

Formed through the cooling of silica-rich magma or from hydrothermal veins. It can be found in igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & Applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, construction sand, and as semiprecious gemstones in jewelry.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to both chemical and physical weathering.

Field Identification & Locations

Identify in the field by its ability to scratch glass and steel, its lack of cleavage (it breaks like glass), and its hexagonal crystal faces if present. Found globally in almost any mountainous or sandy region.

Identified on: 4/27/2026

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