metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
Hardness: 6.0-6.5 (Mohs), Color: Dark green to creamy white, Luster: Vitreous to greasy, Crystal structure: Monoclinic, Cleavage: None (fibrous interlocking structure), 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: Dark green to creamy white, Luster: Vitreous to greasy, Crystal structure: Monoclinic, Cleavage: None (fibrous interlocking structure), Specific gravity: 2.90-3.03
Formation & geological history
Formed through the regional metamorphism of magnesium-rich rocks (ultramafic) or the contact metamorphism of magnesian limestones. It features an extremely tough, interlocking fibrous structure.
Uses & applications
Broadly used for jewelry, lapidary carvings, decorative ornaments, and historically as a tough material for tool-making (axes and blades).
Geological facts
Nephrite is one of two distinct minerals known as jade, the other being jadeite. It was used by many ancient cultures for both its beauty and its exceptional toughness, which exceeds that of steel.
Field identification & locations
Identify by its waxy/greasy luster when polished, high toughness (it resists chipping), and dark green swirls or 'spinach' green color. Often found in riverbeds or near mountain ranges in British Columbia, New Zealand, and China.
More like this
