Granite

Oxide	Analysis	Formula
SiO2	72.04%	7.78
Al2O3	14.42%	0.92
K2O	4.12%	0.28
Na2O	3.69%	0.39
CaO	1.82%	0.21
FeO	1.68%	0.13
Fe2O3	1.22%	0.05
MgO	0.71%	0.11
TiO2	0.30%	0.02
P2O5	0.12%	0.01
MnO	0.05%	-
Oxide Weight		649.79
Formula Weight		649.79

Notes

The chemistry shown here is from the wikipedia page, it is an average from around the world. Obviously there will be quite a bit of variation from this in each local area since the mineral proportions of quartz and feldspar can vary alot.

An example of another approximate analysis of a pink granite in the USA:
CaO 0.4
KNaO 8.4
Al₂O₃ 13.1
SiO₂ 77.1
Fe₂O₃ 0.8
This is quite similar to the average (being lower in iron, lower in CaO, higher in SiO₂.

Related Information

Links

Minerals	Granite Granite is a plutonic rock is found throughout the continental crust, most commonly in mountainous a
URLs	http://en.wikipedia.org/wiki/Granite Granite at Wikipedia

By Tony Hansen
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