mineral

Yellow quartz crystal point, likely citrine-treated quartz

Quartz, SiO₂; probable heat-treated amethyst or iron-stained quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent yellow to honey-orange, vitreous luster, hexagonal crystal structure, conchoidal fracture, and no obvious cleavage. The uneven color, cloudy zones, and iron-orange areas suggest treated or included quartz rather than natural gem-grade citrine.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystals form in hydrothermal veins and cavities, commonly in granitic pegmatites and volcanic rocks; quartz is widespread from Precambrian to modern geological settings. Commercial yellow points are often heat-treated amethyst from Brazil or Uruguay.

Uses & applications

Used as a decorative crystal, lapidary specimen, and inexpensive collector piece; occasionally used in jewelry. Typical value is about $5–$30, or $30–$100 if large, attractive, and confirmed natural citrine.

Geological facts

Natural citrine is relatively uncommon; most bright orange-yellow market material is heat-treated amethyst. Internal fractures, cloudy inclusions, and color zoning are common.

Field identification & locations

Identify by its glassy luster, pointed hexagonal habit, hardness, and lack of cleavage; it should scratch glass but not be scratched by a steel blade. Common sources include Brazil, Uruguay, Madagascar, and Zambia.