mineral

Likely raw amethyst with a tumbled pale-green stone

Amethyst: purple quartz (SiO₂); green specimen is uncertain, possibly fluorite or green quartz

AI-generated identification · may be incorrect

The rough piece has a purple, glassy crystal area in a white matrix; quartz has Mohs hardness 7 and hexagonal crystal structure. The rounded green piece is translucent and polished, so its identity cannot be determined from appearance alone.

Identified October 12, 2026More mineral →

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Physical properties

Formation & geological history

Amethyst forms as quartz in silica-rich hydrothermal veins and gas cavities in volcanic rocks; associated deposits range from ancient to geologically recent. The green stone’s origin is indeterminate from the image.

Uses & applications

Amethyst is used in jewelry and mineral collecting; tumbled stones are commonly sold as decorative pieces.

Geological facts

The white matrix may be quartz or another associated mineral; a hardness test and closer view would help confirm both specimens.

Field identification & locations

Look for purple quartz crystals, typically with vitreous luster, in veins or basalt cavities. Common sources include Brazil and Uruguay; the green specimen needs testing for reliable identification.