Basalt

Oxide	Analysis	Formula
CaO	7.90%	0.32
K2O	0.60%	0.01
MgO	10.30%	0.58
Na2O	2.40%	0.09
TiO2	1.60%	0.05
Al2O3	14.10%	0.31
P2O5	0.30%	-
SiO2	48.60%	1.82
Fe2O3	11.20%	0.16
MnO	0.10%	-
LOI	3.80%	n/a
Oxide Weight		218.89
Formula Weight		227.54

Notes

Volcanic rock essentially of plagioclase, labradorite, magnetite, and pyroxene, with olivine, biotite, and hornblende. Formed by magma emission. There are two distinct basalts: feldspathic and alkaline, both plagioclase feldspathics but the latter containing significantly more sodium and potassium.

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