Oxide

Wt%

Oxide

Wt%

Na₂O

0.615

NiO

0.083

MgO

10.967

CuO

0.011

Al₂O₃

11.869

ZnO

0.008

SiO₂

51.939

As₂O₃

0.000

P₂O₃

o.292

Rb₂O

0.014

SO₃

0.031

SrO

0.014

K₂O

1.490

ZrO₂

0.021

CaO

5.683

Nb₂O₅

0.002

TiO₂

0.754

SnO₂

0.199

Cr₂O₃

0.175

PbO

0.007

MnO

0.402

Cl

0.004

Fe₂O₃

8.730