mineral
Polished pale chalcedony or quartz pebble
Microcrystalline quartz, SiO₂; possibly milky quartz/chalcedony
AI-generated identification · may be incorrectCreamy white to pale yellow, translucent, and glassy to waxy luster with a smooth polished surface. Quartz hardness is Mohs 7, lacks cleavage, has conchoidal fracture, and specific gravity near 2.65; image blur prevents confident texture assessment.
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Physical properties
Creamy white to pale yellow, translucent, and glassy to waxy luster with a smooth polished surface. Quartz hardness is Mohs 7, lacks cleavage, has conchoidal fracture, and specific gravity near 2.65; image blur prevents confident texture assessment.
Formation & geological history
Likely a naturally rounded silica-rich pebble that was tumbled or polished; quartz formed in hydrothermal veins or silica-rich cavities, commonly during younger igneous and sedimentary processes. Exact age and variety cannot be determined visually.
Uses & applications
Used as a decorative tumbled stone, craft material, and sometimes as a low-grade lapidary stone; translucent, patterned material may be sold as common chalcedony or quartz.
Geological facts
The bright spot is reflected light from the polished surface, not necessarily a crystal face. Yellow coloration may reflect iron staining or warm lighting.
Field identification & locations
Test identification with a hardness test against glass, inspect translucency at the edges, and check for conchoidal fracture; avoid scratching valuable specimens. Common in stream gravels and quartz-bearing veins worldwide.
