See Also: orthoclase(medicine)
orthoclase(dictionary)
orthoclase(encyclopedia)

orthoclase (iou)



orthoclase noun. M19.
[from ORTHO- + Greek klasis breaking, cleavage.]
Mineralogy. The common potassium feldspar, a monoclinic silicate of aluminium and potassium characterized by two cleavages at right angles, which occurs widely in rocks and as free crystals.