Component Grains (%) Powders (%)
SiO₂ 99.8 99.8
Al₂O₃ < 0.02 < 0.03
Fe₂O₃ < 0.02 < 0.03
TiO₂ < 0.01 < 0.01
CaO < 0.01 < 0.01
MgO < 0.02 < 0.02
K₂O < 0.01 < 0.01
Na₂O < 0.02 < 0.02
C < 0.01 < 0.01
Quartz (SiO₂) 0 0
Cristobalite (SiO₂) < 0.01 < 0.01
Amorphous matter Fused
Specific Gravity 2.2 –
pH 6.5 –
