metamorphic
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
Hardness: 6.0-6.5 on Mohs scale; Color: typically dark green to blackish-green; Luster: vitreous to greasy; Crystal structure: Monoclinic (fibrous/interlocking microcrystals); Specific Gravity: 2.90–3.03. Notable for its extreme toughness due to interwoven fibers.
- Hardness
- 6
- Color
- typically dark green to blackish-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 on Mohs scale; Color: typically dark green to blackish-green; Luster: vitreous to greasy; Crystal structure: Monoclinic (fibrous/interlocking microcrystals); Specific Gravity: 2.90–3.03. Notable for its extreme toughness due to interwoven fibers.
Formation & geological history
Forms primarily through the metamorphism of magnesium-rich rocks (like serpentinite) or at the contact between dolomite and siliceous igneous rocks. Found in metamorphic belts worldwide.
Uses & applications
Extensively used in jewelry (beads, cabochons), ornamental carvings, sculpture, and historically for tools and weapons due to its toughness.
Geological facts
Nephrite is one of two distinct minerals called jade (the other being Jadeite). It was highly valued in ancient China for ritual objects and as a symbol of status and purity.
Field identification & locations
Identify in the field by its waxy luster, high toughness (it is very difficult to break), and soap-like feel when polished. Commonly found in riverbeds as water-worn boulders in regions like British Columbia, New Zealand, and Wyoming.
More like this
