mineral
Milky quartz vein fragment
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; mostly white to translucent with a vitreous luster and irregular fracture. Trigonal crystal structure, but individual crystals are not distinct in this massive specimen; no cleavage.
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Physical properties
Hardness 7 Mohs; mostly white to translucent with a vitreous luster and irregular fracture. Trigonal crystal structure, but individual crystals are not distinct in this massive specimen; no cleavage.
Formation & geological history
Likely quartz deposited from silica-rich fluids in a fracture, then exposed by weathering. Quartz veins form in many rock types and span a wide range of geological ages; the image alone cannot determine age.
Uses & applications
Commonly used as a source of silica for glass and industrial materials; attractive pieces are collected or used decoratively, though this specimen appears ordinary grade.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, so it is common in veins and sediments.
Field identification & locations
Look for its glassy shine, hardness sufficient to scratch glass, and lack of cleavage; common worldwide in veins and quartz-rich rocks.
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