polycrase

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polycrase [′päl·i‚krās]

(mineralogy)

(Y,Ca,Ce,U,Th)(Ti,Cb,Ta)₂O₆Black mineral composed of titanate, columbate, and tantalate of yttrium-group metals; it is isomorphous with euxenite and occurs in granite pegmatites.

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polyclonal
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polycondensation
polyconic chart
polyconic map projection
polyconic projection
Polycopidae
polycrase
Polycrates
Polycrates' ring
polycrystal
polycrystalline
Polyctenidae
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