Nephrite Jade

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.

Identified on: 4/22/2026

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