mineral

Tumbled citrine quartz (likely heat-treated amethyst)

Quartz, SiO₂; crystalline variety citrine

AI-generated identification · may be incorrect

Hardness 7 Mohs; transparent to translucent yellow-orange color, vitreous luster, and hexagonal crystal structure. Quartz has no cleavage and conchoidal fracture; the rounded shape indicates tumbling or polishing.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Natural citrine forms when iron-bearing quartz crystallizes in hydrothermal veins or cavities, commonly in granitic pegmatites; much commercial citrine is amethyst heated to yellow-orange tones. Quartz is widespread from Precambrian to modern geological settings.

Uses & applications

Used as an inexpensive gemstone, ornamental stone, and collector specimen; polished pieces are sold for jewelry and décor. Typical value is about $5–$30 for a small tumbled piece, higher for confirmed natural citrine.

Geological facts

The image shows a small polished, translucent yellow-orange quartz specimen, but color alone cannot distinguish natural citrine from heat-treated amethyst.

Field identification & locations

Look for glassy luster, strong scratch resistance, translucency, and lack of cleavage; natural citrine often has pale, relatively even coloration, whereas heated amethyst may show deeper orange zones or white bases. Common sources include Brazil, Madagascar, Uruguay, and Zambia.