metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
Hardness: 6.0-6.5 (Mohs scale); Color: Sage to deep green; Luster: Waxy to greasy; Structure: Interlocking fibrous; Specific Gravity: 2.9-3.03
- Hardness
- 6
- Color
- Sage to deep green
- Luster
- Waxy to greasy
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Physical properties
Hardness: 6.0-6.5 (Mohs scale); Color: Sage to deep green; Luster: Waxy to greasy; Structure: Interlocking fibrous; Specific Gravity: 2.9-3.03
Formation & geological history
Forms through the hydrothermal metamorphism of ultramafic rocks or impure limestones. It is characterized by its extremely tough, felted microcrystalline structure.
Uses & applications
Primarily used in jewelry, ornamental carvings, sculpture, and as a gemstone for collectors.
Geological facts
Nephrite is one of two distinct minerals known as jade (the other being Jadeite). It is famous for its exceptional toughness, making it more resistant to fracturing than even diamond.
Field identification & locations
Look for a smooth, waxy surface with possible 'rind' or skin. Found commonly in British Columbia, New Zealand, Russia, and the western United States. It feels heavier than common river stones of the same size.
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