mineral

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: white to colorless; Luster: vitreous to greasy; Crystal Structure: Trigonal (Hexagonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: white to colorless
Luster: vitreous to greasy

Identified June 15, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 7 on Mohs scale; Color: white to colorless; Luster: vitreous to greasy; Crystal Structure: Trigonal (Hexagonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through hydrothermal processes where silica-rich hot fluids circulate through fractures in crustal rocks and crystallize as they cool. These can occur in metamorphic or igneous environments across many geological ages.

Uses & applications

Primary source of silica for glassmaking, electronics, and silicon chips; also used as a decorative stone, in construction as aggregate, and for metaphysical collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge in response to applied mechanical stress, which is why it's used in watches and radios.

Field identification & locations

Identify in the field by its hardness (it will scratch glass and steel), lack of cleavage, and common occurrence in veins. Often found in mountainous regions or areas with high hydrothermal activity.