Quartz (Milky/Common)

Physical Properties

Hardness: 7 on Mohs scale; Color: white to translucent/gray; Luster: vitreous (glassy) to waxy; Crystal structure: Hexagonal; Cleavage: none (conchoidal fracture); SG: 2.65

Formation & Geological History

Forms in igneous, metamorphic, and sedimentary environments; commonly found in hydrothermal veins and pegmatites. This specimen likely weathered out of a vein and was tumbled by water.

Uses & Applications

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

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which has Slavic origins.

Field Identification & Locations

Identify by its ability to scratch glass and lack of cleavage. Look for it in riverbeds, beaches, and mountain trails worldwide.

Identified on: 5/3/2026

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