Atomic and nuclear properties of materials:
Standard rock

Quantity	Value	Units	Value	Units
<Z/A>	0.50000
Density	2.65	g cm-3
Mean excitation energy	136.4	eV
Minimum ionization	1.688	MeV g-1cm2	4.472	MeV cm-1
Nuclear collision length	66.8	g cm-2	25.23	cm
Nuclear interaction length	101.3	g cm-2	38.24	cm
Pion collision length	92.9	g cm-2	35.05	cm
Pion interaction length	130.9	g cm-2	49.40	cm
Radiation length	26.54	g cm-2	10.02	cm
Critical energy	49.13	MeV (for e-)	47.74	MeV (for e+)
Molière radius	11.46	g cm-2	4.323	cm
Plasma energy	33.17	eV
Muon critical energy	693.	GeV

Composition:

Elem	Atomic frac*	Mass frac
Z = 11, A = 22.00	1.00	1.000000
Along with density above, definition of standard rock

Explanation of some entries
For muons, dE/dx = a(E) + b(E) E. Tables of b(E): PS PDF TEXT
Table of muon dE/dx and Range: PS PDF TEXT
Note: Explanation of "Standard Rock."