hydromica


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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.
References in periodicals archive ?
32 [Angstrom], whose values do not change either after saturation with ethylene glycol or after calcination, indicate the presence of rock hydromica.
The dolomite content is about 5%, and the ratio of carbonates to terrigeneous part which consists of fine-grained quartz, orthoclase, mica, marcasite and some hydromica is in the range of 1.