igneous
Tumbled quartz-rich stone, possibly granite or rhyolite
Likely quartz (SiO₂) with feldspar and minor mica or other inclusions
AI-generated identification · may be incorrectSmall rounded, polished pebble with a pale gray-white color, granular texture, and vitreous to dull luster; apparent hardness is roughly 6–7 Mohs. Individual crystals are too small to confirm cleavage or crystal structure visually.
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Physical properties
Small rounded, polished pebble with a pale gray-white color, granular texture, and vitreous to dull luster; apparent hardness is roughly 6–7 Mohs. Individual crystals are too small to confirm cleavage or crystal structure visually.
Formation & geological history
Probably an igneous rock formed by cooling silica-rich magma, then naturally weathered and human-tumbled; the geological age cannot be determined from the photograph. Common possibilities include granite, aplite, or rhyolite.
Uses & applications
Used mainly for craft projects, lapidary collections, décor, and educational samples; it is not typically valuable as jewelry unless it proves to be a distinctive gemstone.
Geological facts
The visible speckling suggests interlocking quartz and feldspar grains rather than a single crystal. A polished surface can make ordinary quartz-rich rock appear more gemstone-like.
Field identification & locations
Common in gravel, river deposits, and landscaping materials worldwide. Identify with a hand lens and streak/scratch tests: quartz grains scratch glass, while the rock should show mixed mineral grains; acid reaction would indicate carbonate instead.
