metamorphic
Nephrite Jade (Hetian Yu)
Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2
Hardness: 6.0-6.5; Color: White to creamy yellow ('Mutton Fat' variety); Luster: Greasy to waxy; Texture: Fine-grained, felted fibrous structure; Specific Gravity: 2.90-3.03
- Hardness
- 6
- Color
- White to creamy yellow ('Mutton Fat' variety)
- Luster
- Greasy to waxy
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Physical properties
Hardness: 6.0-6.5; Color: White to creamy yellow ('Mutton Fat' variety); Luster: Greasy to waxy; Texture: Fine-grained, felted fibrous structure; Specific Gravity: 2.90-3.03
Formation & geological history
Formed via contact metamorphism between magnesium-rich limestones (dolomites) and granitic intrusions. Large boulders are naturally weathered in riverbeds, creating 'seed' jade (Ziyu).
Uses & applications
Highly prized for jewelry, intricate carvings, traditional Chinese art, and as a store of value.
Geological facts
In Chinese culture, nephrite jade (Hetian Jade) is considered more valuable than gold. The 'Mutton Fat' white color with a weathered yellow skin (skin jade) is particularly sought after by collectors.
Field identification & locations
Identify by its characteristic greasy luster and extreme toughness. Authentic Hetian jade is translucent but not transparent. While the user's location (Singapore) is a trade hub, this specimen likely originated from the Kunlun Mountains in Xinjiang, China.
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