#name   Format    Marble
Marble 	1
#
#  Elem	 rho(g/cm^3)	Gas/Solid(1/0) refl.index  Birks c

	3         2.7		0         0     0 0 0
# 	Z	A  	N
	20	40	1
	6	12	1
	8	16	3
