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Related to riebeckite: crocidolite
A dark blue or greenish amphibole mineral, Na2Fe5Si8O22(OH)2, whose fibrous form is known as crocidolite asbestos.
[After Emil Riebeck (1853-1885), German explorer and mineralogist who in 1881 on an expedition to Socotra collected samples in which the mineral was later identified.]
a mineral which is rich in sodium and is often translucent