metamorphic
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂); rock identity cannot be confirmed from the photo
AI-generated identification · may be incorrectPale gray-white with a glassy to dull luster and granular, uneven fracture. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65; the specimen’s grain texture is not clear enough to distinguish quartz from quartzite confidently.
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Physical properties
Pale gray-white with a glassy to dull luster and granular, uneven fracture. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65; the specimen’s grain texture is not clear enough to distinguish quartz from quartzite confidently.
Formation & geological history
Quartz forms in many geological settings; quartzite forms when quartz-rich sandstone recrystallizes during metamorphism. Its age and formation environment cannot be determined from the image.
Uses & applications
Quartz is used in glass, electronics, and abrasives; quartzite is used as building stone and aggregate. Attractive pieces may be collected or used decoratively.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly occurs in veins and many rock types.
Field identification & locations
Check for hardness by seeing whether it scratches ordinary glass, and inspect for distinct grains or cleavage; quartz breaks irregularly rather than along flat cleavage planes. Quartz and quartzite occur worldwide.
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