Type

Character

Subclass naming

Observation No.

High K₂O

High SiO₂

K₂O-high SiO₂

3, 9, 12, 13, 15, 19, 23, 29

Low SiO₂

K₂O-low SiO₂

1, 4, 5, 6, 7, 8, 16, 17, 18, 22

PbO-BaO

High SiO₂ and

low PbO

PbO-BaO-high SiO₂

21, 24, 26, 30, 31, 34, 35, 36, 38, 39, 40, 45, 46, 49, 50, 51, 52, 53, 55, 61, 64

High PbO and low SiO₂

PbO-BaO-high PbO

2, 10, 11, 14, 20, 25, 27, 28, 32, 33, 37, 41, 42, 43, 44, 47, 48, 54, 56, 57, 58, 59, 60, 62, 63, 65, 66, 67