Spherulitic recrystallization of metamict polycrase.
Spherulites occur in the metamict matrix of the rare earth AB(2)A(6-) type niobium-tantalum-titanium oxide, polycrase. Microprobe analyses show that the spherulites are similar in composition to the metamict polycrase except for a fivefold increase in calcium oxide. X-ray examination suggests that the spherulites are a titanium-rich rare earth fersmite.
Ewing
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