M MineralystRock & Mineral Guide
Gemstone

Nephrite

Nephrite — reference photo

Nephrite is a gemstone with the chemical formula Ca2(Mg, Fe)5Si8O22(OH)2. It has a Mohs hardness of 6-6.5 and greasy to vitreous luster.

Nephrite properties

TypeGemstone
Chemical formulaCa2(Mg, Fe)5Si8O22(OH)2
Mohs hardness6-6.5
LusterGreasy to vitreous
Typical colorsDark green, light green, yellow-green
FormationMetamorphic environments, specifically from the alteration of ultramafic rocks
Rarity5 / 10

Mohs hardness 6–6.5 — fairly hard

1 · Talc5 · Apatite10 · Diamond
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