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There are almost 40 different minerals in this group called micas, and their common characteristics are a) they are phyllosilicates, and b) they have perfect basal cleavage, and c) form monoclinic crystals.
In the hand sample they are glittery and some are coloured.
Have a crack at the article Micas in wikipedia.
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∙ 12y ago
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What are the crystals in slate?
The shiny crystals along which slate cleaves are made of mica.
What is the size of crystals in granite?
The size of crystals that form granite are usually large and coarse-grained. Granite, which is mainly composed of feldspar, mica and quartz, is often used as a building material.
Which metamorphic rock will have visible mica crystals and a foliated texture?
quartzite
What is the mineral with crystals that breaks into flat sheets?
Mica is crystalline and forms layers.
Would mica be consider a rock?
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.
What are porphyroblasts and how do they form?
A Porphyroblast is a large crystal formed on the inside of Metamorphic rocks.metamorphic rocks (in)...crystals showing planar surfaces-namely, magnetite, garnet, epidote, mica, calcite, quartz, and feldspar. Minerals that have a tendency to form large single crystals (e.g., garnet) are termed porphyroblasts
What is mica called once its formed intoa metamorphic form?
Mica.
What are the names of songs with food in them?
Lollipop by Mica.
What is mineral crystals of quartz biotite mica and amphibole are produced primarily by?
Cooling and soildification of magma.
Can salts form crystals?
Yes. Salts can form crystals (salt crystals).
The colorless form of mica?
Serecite.
What kind of minerals are in a book?
Mica minerals often appear in 'books' which are stacks of sheet-like mineral crystals.
