igneous/metamorphic
Tumbled quartz-rich rock, possibly granite or quartzite
Quartz (SiO₂) with probable feldspar and mica; exact rock identification is uncertain from the image
AI-generated identification · may be incorrectRounded and polished, translucent gray-white with tan/brown and faint pink areas; glassy to dull luster and granular texture. Quartz has Mohs hardness 7, while feldspar is about 6; cleavage and specific gravity cannot be reliably determined visually.
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Physical properties
Rounded and polished, translucent gray-white with tan/brown and faint pink areas; glassy to dull luster and granular texture. Quartz has Mohs hardness 7, while feldspar is about 6; cleavage and specific gravity cannot be reliably determined visually.
Formation & geological history
Likely formed as an intrusive igneous granite or metamorphosed quartz-rich rock, crystallizing or recrystallizing deep underground over geologic time, then weathered and mechanically tumbled. The polished surface is human-processed.
Uses & applications
Commonly sold as a decorative or lapidary stone for tumbling, crafts, and teaching collections; not typically used as a gemstone unless unusually clear or attractive.
Geological facts
The gray translucent areas are consistent with quartz, while pink or cream grains may be feldspar and darker patches may be mica or iron staining. A hardness test and fresh fracture would distinguish quartzite from granite more reliably.
Field identification & locations
Look for interlocking visible grains: granite shows quartz, feldspar, and mica; quartzite is dominated by fused quartz grains. Common source regions include granitic and metamorphic terrains worldwide.
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