mineral
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly milky quartz or quartzite
AI-generated identification · may be incorrectCream to honey-brown, opaque to weakly translucent, with a dull-to-waxy luster and irregular granular texture. Quartz hardness is Mohs 7; no obvious cleavage, conchoidal fracture, and specific gravity about 2.65.
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Physical properties
Cream to honey-brown, opaque to weakly translucent, with a dull-to-waxy luster and irregular granular texture. Quartz hardness is Mohs 7; no obvious cleavage, conchoidal fracture, and specific gravity about 2.65.
Formation & geological history
Likely a naturally rounded stream or beach pebble, or a tumbled specimen, formed by weathering and abrasion of quartz-rich igneous or metamorphic rock. Its precise geological age and source cannot be determined from the photograph.
Uses & applications
Common quartz pebbles are used decoratively, in landscaping, lapidary work, and inexpensive collections; attractive pieces may be polished or made into cabochons.
Geological facts
The orange-brown coloration may come from iron-oxide staining, while the pale body is consistent with milky quartz or quartzite. A steel knife should not scratch quartz, though it may leave a metallic streak.
Field identification & locations
Look for glassy or waxy luster, very high hardness, lack of cleavage, and conchoidal fracture; confirm with a scratch test on an inconspicuous area. Quartz-rich pebbles occur worldwide in stream gravels, beaches, and glacial deposits.
