Content

Fieldspars

Pegmatite

1^st grade

2^nd grade

1^st grade

2^nd grade

3^rd grade

Fe₂O₃ (%) no more than

0.2

0.3

0.2

8

0.5

K₂O + Na₂O (%) no less than

12

11

8

2

8

CaO (%) no more than

1

1

2

30

2

SiO₂ (%) no more than

8

10

30

0.3

30