How is greenstone made?

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Make-up of Greenstone

Greenstone, also known as greenschist, is a non layered metamorphic rock derived from basalt, gabbro or similar rocks containing sodium-rich plagioclase feldspar, chlorite, epidote and quartz. Chlorite and epidote give the green color.

New Zealand Jade or Greenstone ( Pounamu in Maori ) comes in four main types:
Kawakawa, Kahurangi and Inanga are Nephrite or Calcium Magnesium Silicate.
Tangiwai is Bowenite or Iron Magnesium Silicate.

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