mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale; yellow to golden-brown color; vitreous (glassy) luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.

Identified August 3, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale; yellow to golden-brown color; vitreous (glassy) luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.

Formation & geological history

Forms in hydrothermal veins, pegmatites, and sedimentary environments where silica-rich solutions precipitate or crystallize over long periods, often associated with iron impurities that impart the yellow color.

Uses & applications

Used in mineral collections, crystal healing, decorative items, and occasionally cut as a semi-precious gemstone.

Geological facts

Quartz is one of the most abundant minerals on Earth's continental crust. The yellow coloration in quartz varieties like citrine or yellow quartz is typically caused by trace amounts of iron or natural irradiation.

Field identification & locations

Identified by its high hardness (scratches glass), lack of cleavage, and characteristic yellow hue. Commonly found worldwide in pegmatites, quartz veins, and alluvial deposits.