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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
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References in periodicals archive ?
The amphibole is greenish to brownish to blue, and in some rocks looks like typical riebeckite.
141, states: "Asbestos means the asbestiform varieties of serpentinite (chrysotile), riebeckite (crocidolite), cummingtonite-grunerite, anthophyllite, and actinolite-tremolite.
Arfvedsonite prevails while riebeckite (Fediuk, 2005), for which most manuals on systematic mineralogy claim Socotra for the locus typicus, is substantially less frequent and mostly restricted to narrow rims of zoned amphibole columns only.
The principal rock of the Warsak igneous complex is a medium-grained, gneissic alkaline granite (Kempe, 1973) composed of microcline with minor albite, quartz, aegirine, riebeckite and astrophyllite.
If it replaces a mineral called riebeckite, it forms a semiprecious gemstone called tiger's eye.
The minerals include K-feldspar (microcline), quartz, plagioclase, biotite, aegirine-augite, hornblende, riebeckite, titanite, epidote, apatite, zircon and magnetite.