Crystalline Quartz (Rough)

Physical Properties

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

Formation & Geological History

Formed through the cooling of silica-rich magma or from hydrothermal veins. It is found in various geological environments and ages, from Precambrian to recent, often as a primary mineral in igneous rocks or as a secondary precipitate in voids.

Uses & Applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, construction sand, and widely used as a semi-precious gemstone and for metaphysical/collector interests.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to both chemical and physical weathering, which is why it often dominates the composition of river and beach sand.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass/steel), lack of cleavage, and glassy appearance on fresh surfaces. It is ubiquitous but commonly found in pegmatites, hydrothermal veins, and as grains in sandstone or granite.

Identified on: 4/22/2026

Mode: Standard