mineral

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

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

Hardness: 7 (Mohs scale)
Color: Yellow to golden-brown
Luster: Vitreous (glassy)

Identified April 7, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in igneous and metamorphic environments, often in pegmatite veins or geothermal deposits. Yellow coloration is typically due to iron impurities or natural irradiation of quartz over millions of years.

Uses & applications

Commonly used in jewelry as a semi-precious gemstone, in crystal healing practices, and as a decorative collector's specimen.

Geological facts

Natural citrine is quite rare; most yellow quartz on the market is actually heat-treated amethyst or smoky quartz. It is known as the 'Success Stone' in folklore.

Field identification & locations

Identify in the field by its hardness (will scratch glass but not be scratched by a steel knife) and lack of cleavage. Look for water-worn pebbles in stream beds or vein deposits in granitic rock.

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