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How is greenstone made?

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Answered 2007-12-01 23:41:55

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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