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Shale is a fine-grained sedimentary rock which is formed by the compaction of silt and clay-size mineral particles
From German Schalstein laminated limestone, and Schalgebirge layer of stone in stratified rock. From Old English scealu in its base sense of- thing that divides or separate,
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock
Pyrolite is an igneous rock consisting of about three parts of peridotite and one part of basalt
From the chemical and mineralogical composition of the upper mantle of the Earth
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Opaque Rock