mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous/glassy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Yellow to brownish-yellow
Luster: Vitreous/glassy

Identified May 30, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous/glassy; Crystal Structure: Hexagonal (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Commonly forms in igneous or metamorphic environments when silica-rich fluids cool. It often occurs as a primary mineral in granites or as secondary deposits in veins and river beds. Yellow variations can be caused by iron inclusions or radiation exposure.

Uses & applications

Used in ornamental jewelry, home decor, abrasive manufacturing, and as a component in glass making. Highly valued in metaphysical circles as a healing stone.

Geological facts

While natural yellow quartz (citrine) is rare, most commercially available pieces are heat-treated amethyst. This specimen appears to be a water-worn, naturally occurring quartzite or yellow quartz pebble found in river deposits.

Field identification & locations

Identify in the field by its hardness (will scratch glass), absence of cleavage, and waxy to glassy appearance when wet. Commonly found in riverbeds, glacial tills, and mountainous areas with crystalline basement rocks.