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出典:Wiktionary
Simpson + -ite
simpsonite
出典:Wikipedia
出典:『Wikipedia』 (2011/02/09 23:07 UTC 版)
Simpsonite has a general formula of Al4(Ta,Nb)3O13(OH). It occurs as euhedral to subhedral tabular to short and prismatic crystals, commonly in subparallel groups. Under the petrographic microscope it has a very high relief.