| Element | % |
| Oxide | % |
| k1053-1 |
| |
| |
| Li | 0.000 | | Li2O | 0.001 |
|
5mm and smaller irregular grains
|
|
National Bureau of Standards
|
| |
| B | 0.03 | | B2O3 | 0.11 |
| O | 16.65 | | | |
| Al | 0.08 | | Al2O3 | 0.16 |
| Si | 0.09 | | SiO2 | 0.19 |
| Ti | 0.16 | | TiO2 | 0.26 |
| Fe | 0.18 | | Fe2O3 | 0.26 |
| Ge | 26.36 | | GeO2 | 37.98 |
| Zr | 0.30 | | ZrO2 | 0.40 |
| Ce | 0.46 | | CeO2 | 0.56 |
| Ta | 0.59 | | Ta2O5 | 0.72 |
| Pb | 55.10 | | PbO | 59.35 |
|
|
|
| Sum | 100.0 | | Sum | 100.0 |
|