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Silicate
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=== Sheets === [[File:Silicate-sheet-3D-polyhedra.png|thumb|alt=Sheet Silicates.|Sheet silicates.]] In this group, known as [[phyllosilicates]], tetrahedra all share three oxygen atoms each and in turn link to form two-dimensional sheets. This structure does lead to minerals in this group having one strong cleavage plane. [[Micas]] fall into this group. Both [[muscovite]] and [[biotite]] have very weak layers that can be peeled off in sheets.
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