	BD.8.50	BD.8.52	BD.8.54	BD.9.50	BD.9.67	BD.9.86	BD.13.19	BD.13.28	BD.13.38
Major elements (wt%)
SiO₂	48.3	49.0	46.5	52.0	55.5	44.8	46.3	54.4	55.6
Al₂O₃	8.1	7.6	9.7	12.5	7.5	5.8	7.4	14.5	11.3
Fe₂O₃	32.8	30.6	32.6	21.2	29.7	40.8	33.4	17.4	22.0
MgO	3.9	4.4	4.1	4.1	2.2	3.5	4.2	4.0	2.9
CaO	3.8	2.4	3.1	6.3	2.6	3.1	4.6	3.5	3.6
Na₂O	1.9	1.6	1.2	3.5	1.8	1.30	1.7	3.7	2.7
K₂O	0.9	1.1	1.5	1.5	1.6	0.5	0.3	1.9	1.4
TiO₂	0.6	0.5	0.6	0.5	0.2	0.3	0.6	0.8	0.4
MnO	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.1	0.1
LOI	−0.4	−0.5	−0.2	−0.3	−0.4	−1.1	−0.8	−0.2	−0.3
Sum	99.04	99.4	100.42	100.4	100.8	99.0	100.2	99.9	100.0
Trace elements (ppm)
As	10	20	10	10	10	10	10	10	10
Ba	630	600	730	820	640	240	360	600	730
Cl	220	220	300	190	90	170	90	140	200
Co	20	10	20	20	20	10	10	40	20
Cr	111	118	106	57	12	54	136	500	161
Cu	170	80	90	30	100	70	40	140	100
Ni	60	80	60	30	50	30	40	110	190
P	1020	920	930	800	530	810	1120	650	890
Pb	50	10	10	10	40	10	10	30	10
S	298	237	221	61	184	313	154	321	138
Sn	10	10	10	20	30	10	10	20	10
Sr	410	350	460	640	390	250	410	630	530
V	100	60	90	130	50	70	150	250	70
Zn	140	100	100	80	40	70	100	210	100
Zr	140	130	150	140	150	70	70	150	200