Sulphur 
Iron 
Iron Oxide 
Calcium Oxide 
Carbon Dioxide 
Water 
Water 
Silica 
Soda 
Organic Matter 
(S) 32.27 
(Fe) 27.12 
(FesOa) .76 
(CaO) 19.56 
(CO*) 14.87 
(H*0+) 1.47 
(H* O-) none 
(SiO*) .70 
(NasO) .17 
3.10 
100.02 
It is noteworthy that no alumina (Al*Os) nor mag¬ 
nesia (MgO) has been found in the analysis. This is the 
more significant because there is usually sufficient dolo¬ 
mite (CaCOs. Mg COs ) present in a coal ball to warrant 
the name “dolomitknollen. ” The py rite, FeS*, amounts 
to nearly 60% of the total, and the Calcite, CaCOs, slight¬ 
ly more than 34%. The organic component is unexpect¬ 
edly great and stands out in contrast with the 1.8% to 
2.5% average reported from typical English coal balls. 
Stopes and Watson (1908, p. 193) have given the 
following analyses of three typical English coal balls: 
CaCOs 
MgCOs 
FeCOs 
MnCOs 
Al*Os 
CasP* Os 
FeS* 
Clay 
Organic matter 
Free water 
51.188 87.827 
42.820 6.212 
2.342 1.026 
0.521 0.853 
trace trace 
0.525 trace 
0.339 1.430 
0.119 0.000 
1.855 2.579 
0.264 0.100 
49.355 
39.682 
2.247 
0.597 
0.222 
3.273 
0.058 
4.064 
0.446 
It is noteworthy that the “organic matter” in sample 
three exceeds four percent. 
[ 133 ] 
