Rock Chageability for Various Rocks

This table shows the approximate integrated chargeabilities for various rocks. The values below were obtained by integrating from 0.02 - 1.0 seconds.

Material type	Chargeability (msec)
ground water	0
alluvium	1-4
gravels	3-9
precambrian volcanics	8-20
precambrian gneisses	6-30
schists	5-20
sandstones	3-12
argilites	3-10
quartzites	5-12