Rock Type Modulus of Elasticity
- (MPa x 1000)
Limestone 3-27
Dolomite 7-15
Limestone (very hard) 70
Sandstone 10-20
Quartz-sandstone 60-120
Greywacke 10-14
Siltstone 3-14
Gneiss - fine 9-13
Gneiss - coarse 13-23
Schist - Micaceous 21
Schist - Biotite 40
Schist - Granitic 10
Schist - Quartz 14
Granite - very altered 2
Granite - slightly altered 10-20
Granite - good 20-50
Quartzite - Micaceous 28
Quartzite - sound 50-80
Dolerite 70-100
Basalt 50
Andesite 20-50
Amphibolite 90

The large ranges emphasize the need for testing at each site.