oligoclase

(-klās′)

noun

a plagioclase feldspar whose composition corresponds to 70 to 90 percent albite

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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