See Also: perthite(medicine)
perthite(dictionary)
perthite (iou)
perthite noun. M19.
[from Perth, Ontario, Canada + -ITE1.]
Mineralogy. A variety of alkali feldspar usu. consisting of roughly parallel intergrowths of an exsolved sodium-rich phase (as albite) and a potassium-rich phase (as microcline).
perthitic adjective of or pertaining to (the texture of) perthite E20.
per'thitically adverb in the manner of perthite M20.
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