Resistivities at room temperature From Sears, Zemansky and Young 1976  
 

Substance		resistivity (ohm meter)
Metals	Silver	1.47 E -8
	Copper	1.72 E -8
	Aluminum	2.63 E -8
Alloys	Constantan	49 E -9
	Nichrome	100 E -8
Semiconductors	Carbon	3.5 E -5
	Germanium	.6
	Silicon	2300
Insulators	Glass	E 10 - E 14
	Lucite	> E 13
	Quartz (fused)	75 E 16