metamorphic
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
Hardness: 6.0-6.5 Mohs scale; Color: Deep forest green with yellowish-green translucent edges; Luster: Waxy to greasy; Crystal structure: Monoclinic (interlocking fibrous structure); Cleavage: Indistinct; Specific Gravity: 2.90-3.03.
- Hardness
- 6
- Color
- Deep forest green with yellowish-green translucent edges
- Luster
- Waxy to greasy
Identified More metamorphic →
Explore Nephrite Jade in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.0-6.5 Mohs scale; Color: Deep forest green with yellowish-green translucent edges; Luster: Waxy to greasy; Crystal structure: Monoclinic (interlocking fibrous structure); Cleavage: Indistinct; Specific Gravity: 2.90-3.03.
Formation & geological history
Formed through the metamorphism of magnesium-rich rocks (like serpentinite) or siliceous dolomites. It occurs in subduction zones and mountain belts where high pressure and moderate temperatures transform minerals. Many specimens are found as river-worn cobbles.
Uses & applications
Used extensively in fine jewelry, ornamental carvings, sculpture, and as a durable material for luxury items. Historically used for axe heads and tools due to its extreme toughness.
Geological facts
Nephrite is significantly tougher than steel due to its interwoven fibrous structure. It has been used for over 5,000 years in China, where it is known as the 'Stone of Heaven.' It is one of two minerals correctly called 'Jade' (the other being Jadeite).
Field identification & locations
Identify by its waxy luster, extreme toughness (resistance to chipping), and translucency when a strong light is held to thin edges. Found in British Columbia, New Zealand, Russia, and Wyoming. Collectors look for uniform color and lack of dark inclusions.
More like this
