Table 1.

Elemental composition of BLACKJAK determined by combustion and ICP analysis.

Element	Method	Percentage (%)
C	Combustion analysis	51.1
N		0.88
S		0.75
K	ICP analysis	0.15
P		0.06
Ca		0.90
Mg		0.15
Na		1.27
Fe		2.11
Al		1.02