Rock Type | Hardness, Toughness | Resistance to Stripping1,2 | Surface Texture | Crushed Shape |
---|---|---|---|---|
Igneous | ||||
Granite | Fair | Fair | Fair | Fair |
Syenite | Good | Fair | Fair | Fair |
Diorite | Good | Fair | Fair | Good |
Basalt (trap rock) | Good | Good | Good | Good |
Diabase (trap rock) | Good | Good | Good | Good |
Gabbro (trap rock) | Good | Good | Good | Good |
Sedimentary | ||||
Limestone | Poor | Good | Good | Fair |
Sandstone | Fair | Good | Good | Good |
Chert | Good | Fair | Poor | Good |
Shale | Poor | Poor | Fair | Fair |
Metamorphic | ||||
Gneiss | Fair | Fair | Good | Good |
Schist | Fair | Fair | Good | Fair |
Slate | Good | Fair | Fair | Fair |
Quartzite | Good | Fair | Good | Good |
Marble | Poor | Good | Fair | Fair |
Serpentine | Good | Fair | Fair | Fair |
Notes:
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