Quartz Pebble

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent grayish; Luster: Vitreous/greasy; Crystal Structure: Trigonal (often worn away in pebbles); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed from cooling magma or hydrothermal veins. This specific specimen has been tumbled and rounded by water action in a river or glacial environment (fluvial/alluvial deposition).

Uses & Applications

Abrasives, construction aggregate, glass making, and decorative landscaping. High-purity quartz is used in electronics and clocks.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which originally meant 'hard'.

Field Identification & Locations

Identify in the field by its ability to scratch glass and lack of cleavage. Commonly found in riverbeds, beaches, and soil worldwide. It is very resistant to chemical and physical weathering.

Identified on: 4/14/2026

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