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oligoclase in British English
(ˈɒlɪɡəʊˌkleɪs)
noun
a white, bluish, or reddish-yellow feldspar mineral of the plagioclase series, consisting of aluminium silicates of sodium and calcium. Formula: NaAlSi3O8.CaAl2Si2O8
Word origin
C19: from oligo- + -claseoligoclase in American English
(ˈɑlɪgoʊˌkleɪs)
noun
a plagioclase feldspar whose composition corresponds to 70 to 90 percent albite
Word origin
Ger oligoklas < Gr oligos (see oligo-) + klasis, a fracture (see clastic), in contrast to orthoclase, because cleavage differs slightly from 90°Image ofoligoclase
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