Composition
( oxides )
|
Percentage +/ - 10 % |
Composition
( oxides )
|
Percentage
+/ - 10 %
|
Silica |
72 |
Calcium |
11 |
Magnesium |
2 |
Lanthanum |
1 |
Sodium |
13 |
Cobalt |
0.016 |
Aluminium |
1.5 |
Lead |
< 0.005 |
Antinomy |
< 0.001 |
Mercury |
< 0.0005 |
Arsenic |
< 0.0001 |
Titanium |
< 0.1 |
Barium |
0.02 |
Rubidium |
< 0.05 |
Cadmium |
< 0.0001 |
Iridium |
< 0.05 |
Chromium |
0.15 |
Platinum |
< 0.0001 |