Feldspath G-200 Feldspar

Na2O 3.1% Al2O3 18.6% SiO2 66.6%
K2O 10.8% Fe2O3 0.1%
CaO 0.8%

Volatiles:
Other 0.2%
Loss On Ignition: 0.2%
Expansion: 84.0 x 10e-7 per degree C

Na2O 0.28 Al2O3 1.02 SiO2 6.21
K2O 0.64 Fe2O3 0.00
CaO 0.08

Alumina:Silica ratio is 1.00: 6.08
Neutral:Acid ratio is 1.00: 6.08
Alk:Neut:Acid ratio is 1.00: 1.02: 6.22