metamorphic
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
Hardness: 6.0-6.5 (Mohs scale); Color: Sage green to dark green; Luster: Vitreous to greasy; Crystal structure: Monoclinic (fibrous interweaving); Specific gravity: 2.90-3.03
- Hardness
- 6
- Color
- Sage green to dark green
- Luster
- Vitreous to greasy
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 scale); Color: Sage green to dark green; Luster: Vitreous to greasy; Crystal structure: Monoclinic (fibrous interweaving); Specific gravity: 2.90-3.03
Formation & geological history
Formed through the metamorphism of serpentine or dolomitic limestone under high pressure and low temperature conditions. Commonly associated with subduction zones.
Uses & applications
Used extensively in jewelry, ornamental carving, sculpture, and historically for tools and weapons due to its extreme toughness and resistance to fracturing.
Geological facts
Nephrite is one of two distinct minerals called 'Jade' (the other being Jadeite). It is famously tough because of its interlocking felt-like fibrous structure, making it harder to break than steel in some respects.
Field identification & locations
Identify by its 'waxy' or 'greasy' feel when polished and its extreme density. Often found as rounded river cobbles or boulders in metamorphic belts near serpentine deposits.
More like this
