sericite

[ser-uh-sahyt]
noun Mineralogy.
a fine-grained variety of muscovite produced by the alteration of feldspar.

Origin:
1850–55; < German Sericit. See seric-, -ite1

sericitic [ser-i-sit-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The sericite was spectrally identified while the pyrite was inferred from the presence of spectrally identified jarosite.
The country rocks are predominantly quartz-sericite, hornblende schists, and quartz-sericite-feldspar gneiss.
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