What is mica? Does all mica have silicate?

Question

Is there a general formula for mica?

Answer 1

Mica is a metamorphic rock. It is called schist. It flakes when it breaks apart. It does have a chemical formula. It is:
The general formula:

X2Y4-6Z8O20(OH,F)4
in which X is K, Na, or Ca or less commonly Ba, Rb, or Cs
Y is Al, Mg or Fe or less commonly Mn, Cr, Ti, Li, etc
Z is chiefly Si or Al but also may include Fe3+ or Ti

They come form phylosilicates and I think they all have silicate.

Answer 2

It apparently does have silicate..........Have included a link w/ formula It's all greek to me but maybe not to you.




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http://education.yahoo.com/reference/dictionary/entry/mica
mi·ca (mk) KEY
NOUN:

Any of a group of chemically and physically related aluminum silicate minerals, common in igneous and metamorphic rocks, characteristically splitting into flexible sheets used in insulation and electrical equipment.

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http://en.wikipedia.org/wiki/Mica
Mica classification
Chemically micas can be given the general formula:

X2Y4-6Z8O20(OH,F)4
in which X is K, Na, or Ca or less commonly Ba, Rb, or Cs
Y is Al, Mg or Fe or less commonly Mn, Cr, Ti, Li, etc
Z is chiefly Si or Al but also may include Fe3+ or Ti
Structurally the micas can be classed as di-octahedral (Y = 4) and tri-octahedral (Y = 6). Also if the X ion is K or Na the mica is a common mica whereas if the X ion is Ca the mica is classed as a brittle mica. (Deer p196-197)

Answer 3

Biotite, phlogopite, and muscovite are all varieties of mica, which is a silicate mineral (a phyllosilicate), not a rock. Biotite is K(Mg,Fe)3(AlSi3O10)(OH)2, muscovite is KAl2(AlSi3O10)(OH)2, and phlogpite is KMg3(AlSi3O10)(OH)2. You can see that phlogopite and biotite differ only in that the former does not contain iron. I guess a general formula would be X(AlSi3O10)(OH2), where X stands for K + Al or Mg+Fe.

Answer 4

I have some mica and it is a type of rock there are actually a couple of types that I know of and 1 is black and it peels very easily. and the 2nd is white and it doesn't peel. try going to google .com and type in mica.

Answer 5

Check out this link:

http://en.wikipedia.org/wiki/Mica