mineral

Honey-colored quartz crystal

Quartz (silicon dioxide, SiO₂), likely citrine or iron-stained quartz

AI-generated identification · may be incorrect

Mohs hardness 7; transparent to translucent yellow-brown color, vitreous luster, and conchoidal fracture. Quartz is trigonal and lacks cleavage; the specimen appears irregularly broken rather than naturally terminated.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids and igneous veins; yellow coloration commonly comes from iron impurities or heat-treated amethyst. Its exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a collector specimen, gemstone, and in glass, ceramics, abrasives, and electronics; gem-quality citrine is faceted for jewelry.

Geological facts

Natural citrine is relatively uncommon, while much commercial citrine is heat-treated amethyst. Quartz can scratch ordinary glass and is readily distinguished from softer yellow calcite.

Field identification & locations

Look for glassy luster, hardness, lack of cleavage, and possible hexagonal crystal faces; common sources include Brazil, Madagascar, Uruguay, and the United States. The image alone cannot confirm citrine versus iron-stained quartz or treated material.