Rock Identifier
Yellow Sapphire or Citrine (Al2O3 (Corundum) or SiO2 (Quartz)) — mineral
mineral

Yellow Sapphire or Citrine

Al2O3 (Corundum) or SiO2 (Quartz)

Hardness 9 (Sapphire) or 7 (Citrine) on Mohs scale, yellow color, vitreous luster

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Physical properties

Hardness 9 (Sapphire) or 7 (Citrine) on Mohs scale, yellow color, vitreous luster

Formation & geological history

Formed in igneous or metamorphic rocks (Sapphire) or hydrothermal veins/pegmatites (Citrine)

Uses & applications

Used primarily in jewelry as a faceted gemstone

Geological facts

Yellow sapphires are highly valued in Vedic astrology. Citrine is the traditional birthstone for November.

Field identification & locations

Identified by hardness testing and refractive index. Commonly found in Sri Lanka, Madagascar (Sapphire) or Brazil (Citrine)

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