mineral

Unidentified tumbled amber-colored mineral

Likely microcrystalline quartz (chalcedony), possibly iron-stained feldspar or calcite

AI-generated identification · may be incorrect

Small rounded orange-brown, translucent specimen with a dull-to-waxy luster; exact hardness and crystal structure cannot be determined from the image. Chalcedony is Mohs 6.5–7, whereas calcite is Mohs 3.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

If chalcedony, it formed when silica-rich groundwater filled cavities or fractures, commonly in volcanic rocks; such deposits range from ancient to recent. The smooth shape suggests natural abrasion or tumbling.

Uses & applications

Small pieces are used as lapidary material, craft stone, and inexpensive collectibles; quality depends on color, translucency, pattern, and polish.

Geological facts

The image alone is insufficient for a confident species identification; color may result from iron staining or surface treatment.

Field identification & locations

Test hardness against glass, inspect translucency and fracture, and use vinegar or dilute acid only if calcite is suspected; avoid destructive testing. Similar chalcedony occurs worldwide, including Brazil, Uruguay, India, and the United States.