See Also: plagioclase(medicine)
plagioclase(dictionary)
plagioclase(encyclopedia)
plagioclase (iou)
plagioclase noun. M19.
[from PLAGIO- + Greek klasis breaking, cleavage.]
Mineralogy. Any of a series of triclinic feldspars (sodium or calcium aluminosilicates) which occur widely in rocks and as free crystals (orig. characterized as having two cleavages at an oblique angle).
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