mineral
Small tumbled stone, likely quartz-rich pebble
Probably microcrystalline quartz (SiO₂), but the image is insufficient for a definitive identification
AI-generated identification · may be incorrectTan-brown, opaque to slightly translucent, dull-to-waxy luster, irregular rounded shape, and no visible crystal faces or cleavage. Quartz has Mohs hardness 7 and specific gravity about 2.65; the specimen may also contain iron-oxide staining or other silicates.
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Physical properties
Tan-brown, opaque to slightly translucent, dull-to-waxy luster, irregular rounded shape, and no visible crystal faces or cleavage. Quartz has Mohs hardness 7 and specific gravity about 2.65; the specimen may also contain iron-oxide staining or other silicates.
Formation & geological history
Likely a naturally weathered and possibly tumbled river or beach pebble formed from silica-rich bedrock; its geological age cannot be determined visually. Rounded edges indicate abrasion or human tumbling.
Uses & applications
Small quartz pebbles are used as lapidary material, decorative stones, and inexpensive collectibles; quality depends on translucency, pattern, and polish.
Geological facts
A scratch test against glass can help confirm quartz, though it may damage the specimen; color alone is not diagnostic.
Field identification & locations
Common in river gravels, beaches, and quartz-bearing rocks worldwide. Field identification requires hardness testing, streak, translucency, and ideally acid or mineralogical tests.
