metamorphic
Likely quartzite
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectWhite to cream, massive and dull-to-slightly-glassy; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The photo’s smooth, pale surface is consistent with quartzite, though a hand specimen alone cannot confirm it.
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Physical properties
White to cream, massive and dull-to-slightly-glassy; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The photo’s smooth, pale surface is consistent with quartzite, though a hand specimen alone cannot confirm it.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized and fused during metamorphism; formation age depends on the source sandstone and metamorphic event.
Uses & applications
Used as building and decorative stone, aggregate, and sometimes as a durable carving or landscaping material.
Geological facts
Quartzite is typically much harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
Look for a hard, interlocking quartz texture and a scratch-resistant surface; common in ancient mountain belts worldwide. Estimated value: about $1–$10 for an ordinary hand specimen; decorative or unusually patterned pieces may be worth more.
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