#name format   standard rock.
StdRock  1
#      Z=11, A=22, Z/A = 0.5, Z^2/A = 5.5 rho = 2.8
#
#  Elem	 rho(g/cm^3)	Gas/Solid(1/0)  refl.index Birks c

1         2.8             0               0      0 0 0
# 	Z	A  	N
	11	22	1


