plagioclase definition

  • noun:
    • any one of a standard rock-forming number of triclinic feldspars, composed of mixtures of sodium and calcium aluminum silicates. Also referred to as oligoclase.
    • some of several aluminum silicate feldspathic nutrients varying within their proportion of calcium to salt.
    • an over-all term used of any triclinic feldspar. Understand Note under feldspar.
    • The name distributed by Breithaupt on number of triclinie feldspars the 2 prominent cleavagedirections which tend to be oblique to each other.
    • any one of some triclinic feldspars that form rocks

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    • any one of a standard rock-forming number of…
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