Ironstone

Item	assay
Fe %	52.2 (usually 50-54%)
SiO2%	22.0
CaO%	0.09
Cu %	0.73
S %	0.05
AlO %	0.24
MgO %	0.31
P %	<0.001
As %	0.01%
Pb %	0.015
Bi %	0.009
Se %	0.003
Te %	0.005
H2O %	10.0
Fe2O3	33.40%
Fe3O4	36.15%
SiO2	18.70%
Al2O3	0.180%
MgO	0.285%
CaO	0.178%
K2O3	0.071%