Ca2(Mg,Fe)5Si8O22(OH)2Monoclinic
Nephrite
Ca2(Mg,Fe)5Si8O22(OH)2
SilicatesChemical FormulaCa2(Mg,Fe)5Si8O22(OH)2
Crystal SystemMonoclinic
Mohs Hardness6
Specific Gravity3
ColorWhite, green, black
LusterVitreous to greasy
StreakWhite
CleavageTwo directions
FractureSplintery
Occurrence
Found in metamorphic rocks. The other jade mineral. Tougher than jadeite.