mineral

Tumbled purple quartz, possibly amethyst

Quartz (SiO₂), likely pale amethyst or lavender quartz

AI-generated identification · may be incorrect

Mohs hardness 7; translucent gray-lavender color with a waxy to vitreous luster and no obvious cleavage. It appears rounded and polished, with cloudy inclusions typical of quartz; crystal structure is trigonal.

Identified September 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids and igneous rocks; purple coloration results from trace iron and natural irradiation. The specimen has been human-tumbled and polished, so its geological age cannot be determined from the image.

Uses & applications

Used as a decorative stone, inexpensive jewelry, lapidary material, and mineral collectible. Common tumbled pieces typically have modest value.

Geological facts

Amethyst is the purple variety of quartz, while weakly colored material may be marketed as lavender quartz. Color can fade with prolonged sunlight or heating.

Field identification & locations

Commonly found in Brazil, Uruguay, Mexico, Zambia, and worldwide quartz-bearing veins and cavities. Identify it by hardness, glassy luster, conchoidal fracture, and lack of cleavage; a streak test is white.