mineral

Amethyst-bearing quartz fragment

Quartz, SiO₂, with purple amethyst coloration; likely attached to a green matrix mineral

AI-generated identification · may be incorrect

Small, rough specimen with a purple, translucent crystalline cap and pale green-gray opaque matrix. Quartz hardness is 7 Mohs, vitreous luster, hexagonal crystal structure, and no true cleavage; the green material may be chlorite, epidote, or altered host rock.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Amethyst forms when iron-bearing quartz crystallizes in silica-rich cavities, commonly in volcanic rocks; irradiation and heat produce the purple color. The specimen’s exact age and matrix cannot be determined from the photograph.

Uses & applications

Used as a gemstone, ornamental stone, and common mineral-collection specimen; this tiny rough piece has little industrial value.

Geological facts

The purple zone appears consistent with amethyst, but image quality prevents confident identification of the green matrix or crystal habit.

Field identification & locations

Look for purple quartz with glassy luster, conchoidal fracture, and hardness sufficient to scratch ordinary glass; verify with a loupe and hardness test on an inconspicuous area. Common sources include Brazil, Uruguay, Mexico, Zambia, and Morocco.