mineral
Tumbled milky quartz (probable quartzite or chalcedony pebble)
Quartz, SiO₂; exact variety uncertain from the image
AI-generated identification · may be incorrectCreamy white, opaque to slightly translucent, with a smooth water-worn or tumbled surface and subtle orange-brown iron-oxide staining. Quartz has Mohs hardness 7, vitreous-to-waxy luster, no cleavage, conchoidal fracture, and specific gravity about 2.65.
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Physical properties
Creamy white, opaque to slightly translucent, with a smooth water-worn or tumbled surface and subtle orange-brown iron-oxide staining. Quartz has Mohs hardness 7, vitreous-to-waxy luster, no cleavage, conchoidal fracture, and specific gravity about 2.65.
Formation & geological history
Likely formed as quartz-rich vein material, quartzite, or chalcedony and later rounded by erosion or mechanical tumbling; the geological age cannot be determined visually. Iron-bearing fluids or surface weathering produced the orange staining.
Uses & applications
Common pieces are used as ornamental stones, lapidary material, carvings, and inexpensive collectibles; similar quartz is also used industrially for glass, ceramics, and silicon production.
Geological facts
The elongated pointed shape may indicate deliberate shaping rather than a naturally formed crystal. A steel file should not readily scratch it, while quartz or hardened steel can scratch glass.
Field identification & locations
Common in quartz-bearing rocks worldwide, including Brazil, Madagascar, the United States, and many river gravels; inspect for glass-like fracture and test hardness, but avoid destructive tests on valuable pieces.
