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n.1.(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.
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2+]montmorillonite, disordered kaolinite, mixed-minerals, imperfect hydromica, fine quartz and amorphous phase.
Terragenous matter, or clay minerals, which consists of quartz, hydromica, feldspars et al.