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riebeckite
rie·beck·ite [ rbə kt, r be kt ]


noun 
Definition:
 
blue-black mineral: a blue-black silicate mineral of the amphibole group containing iron and sodium. Source: acidic igneous rocks, schists.
[Late 19th century. After Emil Riebeck (1853-1885), German explorer]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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