mineral

Raw yellow quartz crystal, likely citrine

Quartz (SiO₂), iron-colored variety commonly sold as citrine

AI-generated identification · may be incorrect

Translucent honey-yellow, vitreous luster, irregular fracture, and likely hexagonal quartz structure; hardness Mohs 7, specific gravity about 2.65. The rough shape and lighting make precise identification uncertain; it could also be yellow chalcedony or iron-stained quartz.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in hydrothermal veins, cavities, and igneous pegmatites; yellow coloration commonly results from iron impurities or irradiation and heating. Citrine-bearing quartz is geologically widespread, with deposits ranging from ancient Precambrian rocks to younger volcanic systems.

Uses & applications

Used as a decorative and lapidary stone, in jewelry, and as a collector specimen; ordinary rough pieces have little industrial value compared with clear quartz.

Geological facts

Natural citrine is relatively uncommon; much commercial citrine is heat-treated amethyst or smoky quartz. Quartz commonly shows conchoidal fracture rather than cleavage.

Field identification & locations

Check for glassy luster, hardness sufficient to scratch ordinary glass, and absence of cleavage; a streak test should be white. Common sources include Brazil, Madagascar, Spain, Uruguay, and the United States.