mineral

Tumbled quartz-rich stone, possibly chalcedony or light sandstone

Quartz (SiO₂) if crystalline; possibly microcrystalline quartz (chalcedony) or quartz sandstone

AI-generated identification · may be incorrect

Pale cream to tan, translucent at thin edges, with a dull-to-waxy luster and rounded, abraded surfaces. Quartz hardness is Mohs 7; sandstone is typically 6–7, with no obvious cleavage and a granular or cryptocrystalline texture.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

The image is insufficient for definitive identification; it may be naturally weathered quartz/chalcedony or a tumbled quartz-rich sedimentary fragment. Quartz formed in many geological settings from silica-rich fluids or sediment cementation, ranging from Precambrian to recent.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction; attractive pieces may be sold as inexpensive lapidary or craft stones.

Geological facts

A steel knife should not scratch quartz, though it may scratch softer sandstone or calcite. Acid reaction, streak, and magnified grain texture would help distinguish limestone, sandstone, and quartz.

Field identification & locations

Common in river gravels, veins, beaches, and sedimentary deposits worldwide; inspect with a 10× loupe and test hardness on an inconspicuous area. Likely value: $1–$10 as an ordinary specimen, potentially $10–$30 if unusually translucent or attractive.