metamorphic

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

AI-generated identification · may be incorrect

Hardness: 7 (quartz), Color: White, gray, and brown-red, Luster: Vitreous to dull, Structure: Massive quartz veins with irregular fracture

Identified May 2, 2026More metamorphic →

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Physical properties

Hardness: 7 (quartz), Color: White, gray, and brown-red, Luster: Vitreous to dull, Structure: Massive quartz veins with irregular fracture

Formation & geological history

Formed via hydrothermal precipitation where silica-rich hot fluids filled fractures in existing rock under high pressure and temperature, often during orogenic (mountain-building) events.

Uses & applications

Primary source of industrial silica and quartz; historically used by indigenous peoples for stone tools; occasionally used for gravel or lapidary art if colorful.

Geological facts

Quartz veins are often the primary host for gold deposits, though not all veins contain precious metals. They are a classic example of secondary mineral growth within a primary rock body.

Field identification & locations

Identify in the field by the distinct contrast between the milky white crystalline material and the darker, granular host rock; check for hardness (cannot be scratched by steel). Common in metamorphic terrains and mountain ranges.