Acid Magma - John Seach

Acid magma is silicic or felsic containing the following constituents by weight.

SiO₂ 65-75%
Al₂O₃  12-16%
Fe₂O₃ plus FeO  4-8%
MgO plus CaO  4-6%
Na₂O plus K2O 6-9

Acid Magma
www.volcanolive.com
Copyright John Seach