![Nephrite Jade (Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]) — metamorphic](https://media.rock.id/3e9ef854-d173-45b9-8c3e-34b01b617257-compressed.jpg)
metamorphic
Nephrite Jade
Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]
Hardness: 6-6.5 Mohs scale; Color: Dark olive green with black mottling; Luster: Vitreous to greasy; Crystal Structure: Monoclinic (fibrous microstructure); Cleavage: None (fractures due to interlocking fibers)
- Hardness
- 6-6
- Color
- Dark olive green with black mottling
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6-6.5 Mohs scale; Color: Dark olive green with black mottling; Luster: Vitreous to greasy; Crystal Structure: Monoclinic (fibrous microstructure); Cleavage: None (fractures due to interlocking fibers)
Formation & geological history
Formed through regional metamorphism or metasomatism in contact with ultramafic rocks and dolomitic country rocks. Often found in serpentinite deposits.
Uses & applications
Used extensively in jewelry, ornamental carvings, axes (historically), and as decorative stones in architecture.
Geological facts
Nephrite is significantly tougher than diamond due to its interwoven felt-like structure, making it highly resistant to fracturing despite being less hard on the Mohs scale.
Field identification & locations
Identify in the field by its soapy feel when polished, extreme toughness against hammer strikes, and green streak. Commonly found in British Columbia, New Zealand, China, and Russia.
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