noun
Origin: Ger oligoklas < Gr oligos (see oligo-) + klasis, a fracture (see clastic), in contrast to orthoclase, because cleavage differs slightly from 90°
See oligoclase in American Heritage Dictionary 4
noun
Origin:
Origin: oligo-
Origin: + Greek klasis, cleavage (from klān, to break; see plagioclase)
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