metamorphic

Quartz vein in host rock

Milky quartz (SiO₂), likely in a metamorphic host such as schist or gneiss

AI-generated identification · may be incorrect

The central cream-white, massive piece appears quartz-rich, with a vitreous to dull weathered surface and no obvious cleavage; quartz hardness is 7 Mohs, specific gravity about 2.65. The surrounding dark, foliated rock appears metamorphic, but its identity is uncertain from the image.

Identified September 30, 2026More metamorphic →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich fluids that fill fractures, then may be exposed by erosion; the host rock formed under heat and pressure. Its geological age cannot be determined from the photograph.

Uses & applications

Quartz is used in glass, electronics, and aggregate; attractive pieces are collected or used decoratively. The host rock may have local construction or landscaping uses.

Geological facts

Quartz veins often cut across older rock layers or foliation, recording fluid movement through fractures.

Field identification & locations

Look for the pale, hard, massive vein contrasting with darker foliated host rock; quartz scratches glass and lacks cleavage. Quartz veins occur worldwide in metamorphic and igneous terrains.