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Tim Simmons · 10th April 2016, 08:38 PM

Get the book. Variants of schist are described. The black is the hardest. However they are not jade. Even if jade is also a metamorphic rock

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10th April 2016, 08:38 PM	#5
Tim Simmons Member Join Date: Dec 2004 Location: What is still UK Posts: 5,844	Get the book. Variants of schist are described. The black is the hardest. However they are not jade. Even if jade is also a metamorphic rock .