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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% 0.00
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
URLs http://en.wikipedia.org/wiki/Granite
Granite at Wikipedia

By Tony Hansen


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