sericite

[ ser-uh-sahyt ]

/ ˈsɛr əˌsaɪt /

a fine-grained variety of muscovite produced by the alteration of feldspar.

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From the German word Sericit, dating back to 1850–55. See seric-, -ite¹

ser·i·cit·ic

[ser-i-sit-ik], /ˌsɛr ɪˈsɪt ɪk/, adjective

In igneous rock the ore-bearing solutions may have altered the wall rock to a dense mixture of quartz, sericite, and chlorite.
The Economic Aspect of Geology|C. K. Leith
There is also a small amount of hematite, pyroxene and sericite.
The Long Labrador Trail|Dillon Wallace
There is some sericite present, also magnetite, resulting from the decomposition of the biotite.
The Long Labrador Trail|Dillon Wallace
Where sericite is dominant, the alteration is called sericitic alteration.
The Economic Aspect of Geology|C. K. Leith

Alunite is a potassium-aluminum sulphate, which differs from sericite in that sulphur takes the place of silicon.
The Economic Aspect of Geology|C. K. Leith