What is micas chemical formula?

What is micas chemical formula?

Muscovite

PubChem CID 92027383
Chemical Safety Laboratory Chemical Safety Summary (LCSS) Datasheet
Molecular Formula Al2K2O6Si
Synonyms Muscovite MICA 12001-26-2 Chacaltaite Astrolit More…
Molecular Weight 256.24

What is the primary difference between biotite and muscovite micas?

The key difference between muscovite and biotite is that muscovite contains mainly potassium and aluminium, while biotite mainly contains potassium and magnesium. Muscovite and biotite are phyllosilicate minerals.

Is Phlogopite a phyllosilicate?

Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates. It is also known as magnesium mica.

Is biotite a silicate?

biotite, also called black mica, a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks.

What type of rock is biotite?

igneous rocks
biotite, also called black mica, a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks.

What is muscovite and biotite?

Muscovite is clear, silvery, or coppery silver in color (depending on the thickness of the sample and presence of impurities) whereas fresh biotite is black. When biotite weathers, it can become dark golden or coppery in color. This silvery clear color is characteristic of thin sheets of muscovite.

Is Gibbsite a Phyllosilicate?

The dioctahedral phyllosilicates are based on the structure where the octahedral layers are similar to gibbsite, where Al+3 occupies the cation position. The octahedral sheets in both cases are held together by weak Van der Waals bonds.

What is Dioctahedral and Trioctahedral?

The key difference between dioctahedral and trioctahedral is that dioctahedral refers to having two of the three available octahedrally coordinated positions occupied, whereas trioctahedral refers to having all three available octahedrally coordinated positions occupied.

What is the chemical properties of biotite?

Physical Properties of Biotite
Chemical Classification Dark mica
Diagnostic Properties Dark color, perfect cleavage
Chemical Composition K(Mg,Fe)3(AlSi3O10)(F,OH)2
Crystal System Monoclinic

What is biotite made out of?

Biotite is regarded as a mixture composed of variable proportions of four basic aluminosilicates of potassium, iron, magnesium, or aluminum: annite, K2Fe6(Si6Al2O20)(OH)4; siderophyllite, K2Fe5Al(Si5Al3O20)(OH)4; phlogopite, K2Mg6(Si6Al2O20)(OH)4; and eastonite, K2Mg5A1(Si5Al3O20)(OH)4.

What is the chemical formula for biotite?

Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula K (Mg,Fe) 3 AlSi 3 O 10 (F,OH) 2. Biotite is a solid solution between the end members Phlogopite KMg 3 AlSi 3 O 10 (OH) 2 and Annite KFe 3 AlSi 3 O 10 (OH) 2, although pure Annite does not occur in nature.

What is biotitite made of?

An igneous rock composed almost entirely of dark mica (biotite or phlogopite) is known as a glimmerite or biotitite. Biotite may be found in association with its common alteration product chlorite.

Is biotite a solid solution series?

It is primarily a solid-solution series between the iron – endmember annite, and the magnesium -endmember phlogopite; more aluminous end-members include siderophyllite and eastonite. Biotite was regarded as a mineral species by the International Mineralogical Association until 1998, when its status was changed to a mineral group.

How thick is biotite specimen?

Specimen is approximately 3/8 inch (.95 centimeter) thick. As noted above, biotite is a name used for a number of black mica minerals that have different chemical compositions but very similar physical properties. These minerals generally cannot be distinguished from one another without laboratory analysis.

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