![Nephrite Jade (Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]) — metamorphic](https://media.rock.id/3d820830-96e0-4e6a-8876-23a725e31266-compressed.jpg)
metamorphic
Nephrite Jade
Tremolite-Actinolite solid solution series [Ca2(Mg,Fe)5Si8O22(OH)2]
Hardness: 6.0-6.5 on Mohs scale; Color: Pale green to dark green, white, or yellow; Luster: Vitreous to greasy; Crystal structure: Monoclinic (fibrous/interlocking); Specific gravity: 2.90-3.03
- Hardness
- 6
- Color
- Pale green to dark green, white, or yellow
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.0-6.5 on Mohs scale; Color: Pale green to dark green, white, or yellow; Luster: Vitreous to greasy; Crystal structure: Monoclinic (fibrous/interlocking); Specific gravity: 2.90-3.03
Formation & geological history
Formed through the regional metamorphism of magnesium-rich limestones (marbles) or through the metasomatism of ultramafic rocks in subduction zones.
Uses & applications
Primarily used for jewelry such as bangles, beads, and pendants, as well as decorative carvings, ornamental sculpture, and historically for axe heads and tools due to its extreme toughness.
Geological facts
Nephrite is significantly tougher than Jadeite due to its interlocking fibrous structure, making it incredibly resistant to fracturing. It has been used for over 5,000 years in Chinese culture and is known as the 'Stone of Heaven'.
Field identification & locations
Identify by its greasy luster, lack of visible crystals (it appears smooth/waxy), and extreme toughness. Found commonly in British Columbia (Canada), New Zealand, Russia, and China. Collectors look for translucency and uniformity of color.
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