pyrochlore

noun
py·​ro·​chlore | \ˈpīrəˌklō(ə)r\
plural -s

Definition of pyrochlore 

: a brown or dark reddish mineral NaCaCb2O6F that is isomorphous with microlite and is an oxide and fluoride of sodium, calcium, and columbium

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History and Etymology for pyrochlore

German pyrochlor, from pyr- + Greek chlōros greenish yellow

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