What elements makeup the minerals feldspar, quartz and mica?

Answer 1

Try these:

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

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

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

Answer 2

There are different types of feldspar, all of which will contain some Aluminum, some Silicon, and a bunch of Oxygen atoms. Sometimes the AlSiO is bonded with K (potassium-feldspars), sometimes with Na, and sometimes with Ca --- there are different forms of all of these... But the important elements that will make up a feldspar are K, Al, Si, and O, or Na, Al, Si, and O, or Ca, Al, Si, and O.

Pure quartz is made up of Si and O - different impurities create many different kinds of quartz.

Mica is like feldspar in that it comes in many different forms. O is always present in micas, and Si is usually present, but otherwise you have a long list of different elements that can make up the rest of the mineral. Common forms of mica include Muscovite and Biotite. Since I don't know the exact chemical composition of these I'll link the wikipedia section on those two minerals.
http://en.wikipedia.org/wiki/Muscovite
http://en.wikipedia.org/wiki/Biotite

Answer 3

Feldspar Wiki

Answer 4

Basically all the three minerals will have different proportions of silicate(SiO2) compounds.
Quartz is pure sio2
Feldspar could contain a range of elements in K to Ca series along with sio2
Mica could contain a range of elements ranging from K,Ca, Fe, Mg along with sio2