Quartz (Drusy/Crystalline)

Physical Properties

Hardness: 7 (Mohs scale); Color: Colorless to white/light purple; Luster: Vitreous/glassy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; SG: 2.65

Formation & Geological History

Formed from hydrothermal solutions or cooling silica-rich fluids in cavities or veins within igneous, metamorphic, or sedimentary host rocks.

Uses & Applications

Used in glass manufacturing, electronics (piezoelectricity), timekeeping, jewelry (as druzy settings), and as a common collectible specimen.

Geological Facts

Quartz is the second most abundant mineral in Earth's crust. 'Druse' refers to a surface covered with tiny, glinting crystals that grew into a void.

Field Identification & Locations

Identify by its hardness (scratches glass), glass-like luster, and lack of cleavage. Often found in geodes, vugs, or as vein filling in mountain ranges.

Identified on: 5/14/2026

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