plagioclastic

• a word derived from plagioclase.
  plagioclase

  noun

  any of the feldspar minerals varying in composition from acidic albite, NaAlSi 3 O 8 , to basic anorthite, CaAl 2 Si 2 O 8 , found in most igneous rocks: shows twinning striations on good cleavage surfaces.

Example Sentences

See Examples For:

plagioclastic

Both plagioclastic and orthoclastic aventurine occur at several localities in the United States.

From Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" by Various

There are consequently two series of felspars, one termed orthoclastic or orthotomous, and the other plagioclastic or clinotomous.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" by Various

More Suggestions

• bioclastic
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• anaclastic
• anticlastic
• bioplastic
• cataclastic