polycrase
noun
poly·crase
-āz
plural -s
: a mineral (Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6 consisting of a columbate and titanate of the metals of the yttrium group that is isomorphous with euxenite (hardness 5–6, specific gravity 5)
Word History
Etymology
German polykras, from poly- + -kras (from Greek krasis mixing, combination)