mineral

Likely tumbled amber or honey-colored quartz

Uncertain; possible amber (fossilized resin) or citrine quartz (SiO₂)

AI-generated identification · may be incorrect

The specimen is strongly out of focus, but appears translucent orange-brown with a smooth, polished/tumbled surface. Quartz has Mohs hardness 7, vitreous luster, no obvious cleavage, and specific gravity about 2.65; amber is much softer (Mohs 2–2.5), lightweight, resinous, and may show bubbles or flow lines.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

If quartz, it formed in silica-rich hydrothermal or igneous environments; if amber, it is fossilized tree resin, commonly Cretaceous to Cenozoic in age. The image does not resolve diagnostic features.

Uses & applications

Tumbled quartz is used for ornaments, cabochons, and collecting; amber is used in jewelry and decorative objects. Typical value is modest unless exceptionally clear, large, or containing inclusions.

Geological facts

Amber may float in concentrated salt water and can acquire static when rubbed; quartz will not. A steel knife generally scratches amber but not quartz.

Field identification & locations

Near 26.1°S, 55.1°W in northeastern Argentina, quartz/chalcedony is a more plausible regional identification than amber. Photograph it in focus beside a ruler and test hardness and weight; avoid destructive tests.