metamorphic
Polished Nephrite Jade
Calcium magnesium iron silicate hydroxide - Ca2(Mg,Fe)5Si8O22(OH)2
Hardness: 6-6.5 on Mohs scale; Color: Dark olive green; Luster: Waxy to greasy; Structure: Fibrous microcrystalline (tremolite-actinolite amphibole aggregate); Toughness: Exceptionally high.
- Hardness
- 6-6
- Color
- Dark olive green
- Luster
- Waxy to greasy
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Dark olive green; Luster: Waxy to greasy; Structure: Fibrous microcrystalline (tremolite-actinolite amphibole aggregate); Toughness: Exceptionally high.
Formation & geological history
Formed through contact or regional metamorphism of magnesium-rich rocks (dolomites) or ultramafic rocks in subduction zones.
Uses & applications
Used widely in lapidary arts, jewelry, carvings, beads, cabochons, and ornamental objects.
Geological facts
Nephrite jade is celebrated for its incredible toughness due to its interlocking fibrous crystal structure, making it historically preferred for tools, weapons, and intricate carvings.
Field identification & locations
Look for a smooth, waxy polish, high density, and extreme resistance to scratching or chipping. Highly prized in Asian, Maori, and Mesoamerican cultures.
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