Phase (wt. %)	Formula	FA PS1	FA PS2	BA PS1	GA East
Mullite	3Al2O32SiO2 or 2Al2O3SiO2	15.30	29.70	15.30	14.70
Quartz	SiO2	52.70	18.66	29.60	12.51
Hematite	Fe2O3	0.68	0.95	0.63	0.37
Lime	CaO	0.11	0.30	n.d.	n.d.
Cristoballite	SiO2	0.03	0.10	0.29	0.43
Sillimanite	Al2SiO5	0.21	0.67	0.05	0.16
Calcite	CaCO3	0.36	0.05	0.77	0.97
Magnetite	Fe3O4	0.43	0.68	0.40	0.41
Plagioclase	NaAlSi3O8	n.d.	n.d.	8.21	12.39
Periclase	MgO	n.d.	1.41	n.d.	n.d.
Amorphous		30.16	47.49	44.74	58.07
Loss on ignition		7.04	4.01	5.47	6.90