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Webster 1913 Edition
Hydromica
Hyˊdro-mi′ca
,Noun.
[
Hydro-
, 1 + mica
.] (Min.)
A variety of potash mica containing water. It is less elastic than ordinary muscovite.
Hydromica schist
(Min.)
, a mica schist characterized by the presence of hydromica. It often has a silky luster and almost soapy feel.