Cracks and pores: a closer look.
Most pores and some cracks in several rocks, as directly viewed with a new technique, have a shape that suggests an origin early in the history of these rocks. Thus, behavior in the laboratory may be a reliable indication of behavior in the earth's crust, for electrical resistivity, permeability, or other properties that depend on microporosity.
Brace
W F
WF
Silver
E
E
Hadley
K
K
Goetze
C
C