metamorphic
Quartz-rich rock fragment (possibly milky quartz or quartzite)
Quartz (SiO₂), possibly as quartzite; identification is uncertain from the image alone
AI-generated identification · may be incorrectPale cream to white, irregular and rough, with a dull-to-glassy luster. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65; the fragment’s hardness cannot be confirmed visually.
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Physical properties
Pale cream to white, irregular and rough, with a dull-to-glassy luster. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65; the fragment’s hardness cannot be confirmed visually.
Formation & geological history
Quartz may crystallize from silica-rich fluids or occur as grains recrystallized into quartzite during metamorphism. Its age and exact formation environment cannot be determined from the photograph.
Uses & applications
Quartz-rich material is used in glassmaking, abrasives, and construction; attractive pieces may be kept as collectibles.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly occurs in many rock types.
Field identification & locations
Look for hardness sufficient to scratch glass and lack of cleavage; quartzite typically shows fused, interlocking grains. Common worldwide; a fresh surface or hardness test would help distinguish quartz from quartzite.
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