Hydromica

Hy`dro`mi´ca

(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.

hydromica

[¦hī·drō′mī·kə] (geology) Any of several varieties of muscovite, especially illite, which are less elastic than mica, have a pearly luster, and sometimes contain less potash and more water than muscovite. Also known as hydrous mica.

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