sericite
noun
ser·i·cite
ˈserəˌsīt
plural -s
: a scaly variety of muscovite having a silky luster and occurring in various metamorphic rocks
sericitic adjective
¦⸗⸗¦sitik
Word History
Etymology
German sericit, from Latin sericus silken + German -it -ite
First Known Use
1853, in the meaning defined above