mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous to dull luster, with irregular fracture and no cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The specimen appears rough and massive, though the photo cannot confirm mineral identity conclusively.
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Physical properties
White to translucent, vitreous to dull luster, with irregular fracture and no cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The specimen appears rough and massive, though the photo cannot confirm mineral identity conclusively.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, and also occurs in igneous and metamorphic rocks. Quartz is common across many geological ages and environments.
Uses & applications
Used as a silica source in glass and industrial materials; attractive pieces are collected or used in crafts and jewelry.
Geological facts
Quartz is among Earth’s most abundant minerals and resists scratching by a steel knife.
Field identification & locations
Look for glassy fracture surfaces, hardness near 7, and absence of cleavage; common worldwide in veins, granites, and metamorphic rocks. Similar-looking calcite is softer and may fizz in dilute acid.
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Granite
Granite (Phaneritic intrusive igneous rock)
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