Nephrite Jade Nefrita Ca2 (Mg,Fe)5(OH,F)Si4O11)2, variety of the calcium and magnesium - amphibole mineral actinolite, green stone, pedra verde

Nephrite is monoclinic Nephrite has a splintery fracture, vitreous or silky luster with dark-colored inclusions.

A calcium and ferromagnesian silicate, nephrite is the massive form of Actinolite and Tremolite ( See amphibole ) It forms translucent-to-opaque, mottled green, compact aggregrate composed of interwoven long thin fibers. Nephrite occurs in rocks subjected to low-grade metamorphism.

Crystal system - monoclinic

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