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Definition of perthitic - 1 dictionary result

perth⋅ite

[pur-thahyt]
–noun Mineralogy.
a variety of feldspar containing irregular bands of albite in microcline.

Origin:
1832; named after Perth, Ontario, Canada; see -ite 1


per⋅thit⋅ic [per-thit-ik] , adjective
per⋅thit⋅i⋅cal⋅ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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