metamorphic

Nephrite Jade

Tremolite-Actinolite series: Ca2(Mg,Fe)5Si8O22(OH)2

AI-generated identification · may be incorrect

Hardness: 6-6.5 (Mohs), Color: Dark green to creamy white, Luster: Vitreous to greasy, Structure: Microcrystalline fibrous (interlocking), Specific Gravity: 2.9-3.0

Hardness: 6-6

Identified June 27, 2026More metamorphic →

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Physical properties

Hardness: 6-6.5 (Mohs), Color: Dark green to creamy white, Luster: Vitreous to greasy, Structure: Microcrystalline fibrous (interlocking), Specific Gravity: 2.9-3.0

Formation & geological history

Formed via regional metamorphism of magnesium-rich limestones or dolomites, or from the hydrothermal alteration of ultramafic rocks. Found in tectonic subduction zones globally.

Uses & applications

Highly prized for lapidary arts, jewelry, traditional carvings, and sculpture due to its extreme toughness/resistance to fracturing.

Geological facts

Nephrite is actually tougher (more resistant to breaking) than its cousin Jadeite because of its felted, interlocking needle-like crystal structure. It was once believed to cure kidney ailments.

Field identification & locations

Field identification involves checking for a greasy luster and high toughness; it is difficult to break with a hammer. Often found as water-worn cobbles in rivers. Check for translucency on thin edges.