Quartz on Matrix

Physical Properties

Hardness: 7 on Mohs scale; Color: Colorless to white/tan; Luster: Vitreous/glassy; Structure: Hexagonal; Cleavage: None/conchoidal fracture; Specific gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes where mineral-rich hot water cools in crustal fissures, or as a late-stage crystallization in igneous melts. Occurs across all geological eras.

Uses & Applications

Used in electronics, glass manufacturing, abrasives, and as semi-precious gemstones in jewelry and specimen collecting.

Geological Facts

Quartz is the second most abundant mineral in the Earth's continental crust. It is piezoelectric, meaning it generates an electric charge in response to mechanical stress.

Field Identification & Locations

Identify by its hardness (scratches glass), glassy luster on fresh surfaces, and lack of cleavage. Often found in veins or as loose pebbles in gravel and streams.

Identified on: 5/18/2026

Mode: Standard