sericite

[ ser-uh-sahyt ]

/ ˈsɛr əˌsaɪt /

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

Origin of sericite

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