pyrochlore
noun
py·ro·chlore
ˈpīrəˌklō(ə)r
plural -s
: a brown or dark reddish mineral NaCaCb2O6F that is isomorphous with microlite and is an oxide and fluoride of sodium, calcium, and columbium
Word History
Etymology
German pyrochlor, from pyr- + Greek chlōros greenish yellow