Oxide

Wt%

Oxide

Wt%

Na₂O

0.51

CuO

0.004

MgO

13.38

ZnO

0.012

Al₂O₃

10.04

As₂O₃

0.003

SiO₂

46.19

Rb₂O

0.010

P₂O₅

0.17

SrO

0.010

SO₃

0.02

Y₂O₃

0.004

K₂O

0.66

ZrO₂

0.009

CaO

6.76

Nb₂O₅

0/006

TiO₂

1.02

SnO₂

0.759

Cr₂O₃

0.47

PbO

0/012

MnO

0.65

Cl

0.001

Fe₂O₃

14.38

Br

0.012

NiO

0.104