metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
Hardness: 6.0-6.5 (Mohs), Color: Sage to deep forest green (due to iron content), Luster: Vitreous to greasy, Crystal structure: Monoclinic (fibrous interlocking), Specific gravity: 2.90-3.03.
- Hardness
- 6
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.0-6.5 (Mohs), Color: Sage to deep forest green (due to iron content), Luster: Vitreous to greasy, Crystal structure: Monoclinic (fibrous interlocking), Specific gravity: 2.90-3.03.
Formation & geological history
Formed through regional metamorphism or metasomatism of magnesium-rich rocks. It is found in massive form rather than distinct crystals. Common in tectonic plate subduction zones.
Uses & applications
Predominantly used for jewelry (pendants, beads), ornamental carvings, and historical tools or weapons due to its extreme toughness.
Geological facts
Nephrite is significantly tougher than diamond in terms of fractures, making it extremely difficult to break. It has been used for over 5,000 years, notably in Chinese culture where it is known as the 'Stone of Heaven'.
Field identification & locations
Identify by its 'soapy' or greasy feel and sage-green translucency. It won't be scratched by a steel knife but can be scratched by quartz. Locations include British Columbia, New Zealand, Russia, and Wyoming.
More like this
