gemstone

Small polished purple stone, likely amethyst

Amethyst, purple variety of quartz (SiO₂)

AI-generated identification · may be incorrect

The smooth, tumbled-looking piece is translucent to opaque purple with a vitreous luster. Quartz has Mohs hardness 7 and a trigonal crystal structure; the image does not show enough detail to confirm the identification or cleavage.

Identified September 23, 2026More gemstone →

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Physical properties

Formation & geological history

Amethyst forms when silica-rich fluids deposit quartz in cavities, often in volcanic rocks; its purple color is associated with trace iron and natural radiation. Such deposits range from geologically young to hundreds of millions of years old.

Uses & applications

Used in jewelry and decorative objects, and collected as a colorful quartz variety.

Geological facts

Amethyst’s purple color can vary from pale lilac to deep violet; heat treatment may alter its color.

Field identification & locations

Check for glassy luster, hardness, and natural color zoning; common sources include Brazil, Uruguay, and Zambia. A photograph alone cannot establish that this is amethyst rather than another purple stone.