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Definition of plagioclastic - 1 dictionary result

pla⋅gi⋅o⋅clase

  [pley-jee-uh-kleys]
Use plagioclastic in a Sentence
–noun
any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on good cleavage surfaces.
Also called soda-lime feldspar.

Origin:
1865–70; plagio- + -clase

Related forms:
pla⋅gi⋅o⋅clas⋅tic  [pley-jee-uh-klas-tik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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