riebeckite

noun
rie·​beck·​ite | \ˈrēˌbeˌkīt\
plural -s

Definition of riebeckite 

: a black monoclinic amphibole Na2Fe5Si8O22(OH)2 containing much iron and sodium

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History and Etymology for riebeckite

German riebeckit, from Emil Riebeck †1885 German explorer + German -it -ite

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