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).