Citrine
Citrine is a yellow quartz named after the citrus fruit, a gemstone that conveys a bright and positive impression. Natural citrine is extremely rare, and most of what is on the market is amethyst that has been heat-treated.
Vibrant yellow citrine
Basic Information
| Chemical Formula | SiO₂ |
|---|---|
| Classification | Trigonal Crystal System |
| Hardness | 7 (Mohs scale) |
| Specific Gravity | 3.65 |
| Crystal Habit | Prismatic/Massive (conforming to quartz) |
Characteristics
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Etymology: Named after its "citron" color.
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Natural Citrine is Rare: Most circulated citrine is heat-treated amethyst.
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Color Variations: Light Yellow Citrus Yellow Deep Golden
Varieties & Aliases
- Variety Citrine Rock Crystal (mixed with colorless portions)
- Variety Ametrine (mixed with purple amethyst)
- Variety Citrine Smoky Quartz (containing brown tones)
Treatments & Processing
- Heat treatment of amethyst to transform it into citrine is common
- Resin impregnation for visual crack filling
Similar or Related Stones
- Topaz: Similar yellow hue but differs in hardness and refractive index
- Scapolite & Feldspar: Similar in pale coloration
- Amethyst: Highly relevant as the source of treatment