mineral

Tumbled citrine (likely heat-treated amethyst or quartz)

Quartz, SiO₂; yellow coloration from iron impurities or irradiation/heat treatment

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent honey-yellow color, vitreous luster, massive/granular texture, no visible cleavage, conchoidal fracture, specific gravity about 2.65. The rounded shape indicates tumbling or natural abrasion.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in hydrothermal veins and cavities in igneous and metamorphic rocks; citrine commonly develops from iron-bearing quartz, while commercial material is often heat-treated amethyst. Quartz is geologically widespread and ranges from Precambrian to modern deposits.

Uses & applications

Used as an inexpensive gemstone, decorative stone, and collector specimen; polished pieces are used in jewelry and ornaments. This small tumbled specimen has modest commercial value.

Geological facts

Natural citrine is relatively uncommon; much marketed citrine is heat-treated purple amethyst that acquires an orange-yellow color. Its color and transparency can overlap with yellow chalcedony or glass.

Field identification & locations

Common sources include Brazil, Uruguay, Madagascar, Zambia, and Spain. Identify it by glassy luster, quartz-like translucency, lack of cleavage, and inability to scratch it with a steel knife; laboratory testing is needed to confirm natural versus treated origin.