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Rock Conditions:

Rock Condition
As rock condition is a key factor to cutters selection. The following is a table of rock condition.

Rock Compressive Strength Sd(MPa) Tensile trength Sz (MPa)
Characteristics
min. average max. min. average max.
Sandstone 25 170 320 5.1 17.3 30.7 High abrasiveness, massive
Siltstone 30 95 180 4.1 8.5 19.0 Low abrasiveness, inhomogenous
Basalt 50 145 280 7.3 14.0 23.3 Soft, fissures, can be split
Slate/Schist 55 110 250 9.3 13.6 31.1 Fissures and cracks present
Gneiss 55 140 330 7.7 17.2 30.6 Cracks, fissures and crevices present
Marble 60 120 175 6.0 11.0 18.5 Non abrasive, cracks
Limestone 75 130 270 7.2 11.9 23.2 Non abrasive, brittle
Granite 85 170 285 7.8 13.8 22.5 Hard and massive, few cracks and fissures
Dolomite 85 195 315 12.5 16.8 21.6 Very abrasive but massive, high strength
Amphibolite 110 195 280 17.2 18.6 22.0 Tough rock, not desirable
Diorite 120 135 150 13.8 14.5 15.0 Hard and massive, few cracks and fissures
Andesite 150 190 240 12.0 17.9 23.8 High strength, fine grained
Quartz 240 280 340 15.3 19.0 24.3 Very abrasive, massive, homogenous