Quartz (Druzy)

Physical Properties

Hardness: 7 on Mohs scale; Color: Clear to milky white; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & Geological History

Formed from silica-rich hydrothermal fluids cooling in rock cavities or fractures. This specific specimen is a 'druzy' formation, where small crystals coat the surface of another rock or host matrix.

Uses & Applications

Used in jewelry (especially pendants), decorative home decor, crystal healing collections, and as a source of silica for glass and electronics manufacturing.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Druzy quartz is unique because the tiny crystals reflect light like sugar or snow, a phenomenon often called 'scintillation'.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass) and its crystalline habit. Often found inside geodes or lining cracks in igneous and sedimentary rocks. Popular with beginner collectors due to its sparkle.

Identified on: 4/27/2026

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