Definitions

from The Century Dictionary.

  • noun The name given by Breithaupt to the group of triclinie feldspars the two prominent cleavagedirections in which are oblique to each other.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) A general term used of any triclinic feldspar. See the Note under feldspar.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy Any of a group of aluminum silicate feldspathic minerals ranging in their ratio of calcium to sodium.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any of a series of triclinic feldspars that form rocks

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From plagio- + -clase, after German Plagioklas.

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