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Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities
From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung
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