metamorphic
Yellow Quartz (Citrine Quartzite)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Yellow to golden orange; Luster: Vitreous/Waxy when tumbled; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Yellow to golden orange
- Luster
- Vitreous/Waxy when tumbled
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Physical properties
Hardness: 7 (Mohs scale); Color: Yellow to golden orange; Luster: Vitreous/Waxy when tumbled; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone or through hydro-thermal processes where iron impurities provide the yellow tint. It is commonly found in alluvial deposits or as tumbled river stones.
Uses & applications
Primarily used in jewelry, as decorative stones/tumbled pebbles, and in crystal healing collections. High-purity quartz is also used in glassmaking and electronics.
Geological facts
Natural yellow quartz is often confused with heat-treated amethyst. When natural, it is much rarer. In ancient times, it was believed to hold the power of the sun and protect against snake venom.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and lack of cleavage. Look for the characteristic yellow hue and translucency. Common in riverbeds and gravel pits.
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