mineral

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions

Hardness: 7 on the Mohs scale; Color: Translucent yellow to honey-orange; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on the Mohs scale
Color: Translucent yellow to honey-orange
Luster: Vitreous (glassy)

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins or as a secondary mineral in sedimentary deposits. The yellow coloration is typically the result of iron impurities or natural irradiation of quartz. These specimens are often water-worn in riverbeds or coastal areas.

Uses & applications

Used widely in the lapidary arts for cabochons and tumbled stones, decorative landscaping, and as a popular 'healing crystal' in metaphysical circles.

Geological facts

Natural yellow quartz is relatively rare compared to clear quartz. While high-grade Citrine is a precious gemstone, common yellow quartz like this specimen is a staple for rock tumblers because it polishes to a very high shine.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife) and its lack of cleavage (it breaks in smooth, curved shell-like patterns). Commonly found in gravel pits, riverbeds, and along beaches in regions with granitic bedrock.

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