Quartz in Matrix

Physical Properties

Hardness: 7 on Mohs scale; Color: Clear to white (milky) interior, brown/tan exterior matrix; Luster: Vitreous (glassy) on fresh surfaces; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).

Formation & Geological History

Formed from silica-rich hydrothermal fluids cooling in veins or cavities within host rocks. It can form in igneous, metamorphic, and sedimentary environments across various geological ages.

Uses & Applications

Quartz is used extensively in glassmaking, electronics (piezoelectric properties), abrasives, and as a popular collector's mineral and gemstone.

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 grains of sand when other minerals have decomposed.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and glassy appearance. Commonly found in mountainous regions or as river stones.

Identified on: 4/17/2026

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