metamorphic
Greenstone / Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Actinolitic Schist
Hardness: 6.0-6.5 (Mohs scale), Color: Dull olive-green to dark grayish-green, Luster: Waxy to greasy when wet, Crystal structure: Monoclinic (fibrous), Dense and extremely tough.
- Hardness
- 6
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Physical properties
Hardness: 6.0-6.5 (Mohs scale), Color: Dull olive-green to dark grayish-green, Luster: Waxy to greasy when wet, Crystal structure: Monoclinic (fibrous), Dense and extremely tough.
Formation & geological history
Formed via low-grade metamorphism of mafic to ultramafic igneous rocks or silicate-rich limestones in subduction zones. Common in ophiolite complexes.
Uses & applications
Historically used for tools and weapons due to its toughness; currently used in jewelry, sculptures, and ornamental carvings.
Geological facts
Nephrite jade is tougher than diamond in terms of resistance to fracturing because of its interlocking fibrous structure. It has been used by cultures worldwide for millennia.
Field identification & locations
Identify in the field by its distinctive green hue, heavy weight for its size, and the way it feels smooth and 'soapy' or greasy when wet. Check for a light green streak and resistance to scratching from a pocket knife.
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