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dumortierite dumortierite
/ dju:5mC:tiErait /

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◙ noun
1. [mass noun] a rare blue or violet mineral occurring typically as needles and fibrous masses in gneiss and schist. It consists of an aluminium and iron borosilicate
• 蓝线石1. late 19th cent.: from the name of V.-E. Dumortier (1802–76), French geologist, + -ite

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