mineral
Yellow Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Pale yellow to golden, Luster: Vitreous, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Pale yellow to golden, Luster: Vitreous, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed in igneous and metamorphic rocks through hydrothermal activity or as crystals in pegmatites and veins where silica-rich fluids cool and crystallize.
Uses & applications
Used in gemstone carvings, jewelry (as a citrine substitute), decorative ornaments, and by crystal collectors for metaphysical purposes.
Geological facts
Yellow quartz is often mistakenly called citrine, but natural citrine is much rarer. Most golden-yellow quartz commercially available is either cloudy yellow quartz or heat-treated amethyst.
Field identification & locations
Identify by its hardness (will scratch glass), lack of cleavage, and translucent to transparent yellow hue. This specimen is carved into a 'star' shape, a popular form for gift and metaphysical shops.
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sedimentary
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Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock