Muscovite mica has perfect cleavage in one direction. It splits into thin sheets.
Muscovite mica is primarily broken by fracturing.
Fuchsite is a mineral, not a rock. It is a type of muscovite (mica). It is green because it is chromium-rich. trivalent Cr replaces Al. Fuchsite can form either by hydrothermal alteration or alteration due to reduced conditions in sedimentary rocks.
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Mica is not a type of foliated rock but is in fact the name for a subdivision of a group of minerals known as Phyllosilicates. They form as parallel sheets of silicate tetrahedra resulting in thin sheet like crystals. Foliations are planer alignments of crystals within metamorphic and igneous rocks and foliated rocks may contain micaceous minerals. See the related link for a picture of a Quartz-Mica Schist seen in thin section and viewed through a petrographic microscope with the polarising filters crossed. In the example picture the white, grey and black amorphous blobs are quartz crystals and the long, thin, brightly coloured (predominantly blue and yellow) crystals are muscovite mica.
mica
Muscovite mica is primarily broken by fracturing.
Muscovite (clear) and Biotite (black) are the commonest mica forms. Fuchsite (green) is an unusual mica containing chromium. Please see the related link below for a listing of the mica group of minerals.
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The delicate bright silver flakes in a granite specimen are most likely mica minerals. Mica is a common mineral found in granite that has a shiny, reflective quality and can appear silver. Mica flakes in granite give the rock a bit of sparkle and can add to its overall aesthetic appeal.
In Russia they made windows out of a type of mineral called Muscovite.
Muscovite generally displays a micaceous crystal habit, of thin flexible sheets.
Fuchsite is a mineral, not a rock. It is a type of muscovite (mica). It is green because it is chromium-rich. trivalent Cr replaces Al. Fuchsite can form either by hydrothermal alteration or alteration due to reduced conditions in sedimentary rocks.
Mica is a solid
mica
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