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More model informationThis is a blueschist facies metabasite. Blueschists are typically finegrained, making it difficult to discern individual mineral grains. The blue colour is imparted to these rocks by thr presence of blue (sodic) amphiboles - in this case that is likely to be riebeckite. This specimen also appears to be sheared, and has a greenschist facies matrix that envelops the phacoids of blueschist.
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