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Coquina is a sedimentary rock that is composed either wholly or almost entirely of the transported, abraded, and mechanically-sorted fragments of the shells of molluscs, trilobites, brachiopods, or other invertebrates
From Concha (Latin)+ Coquina(Spanish) +conch(English)= Couquina (mid 19th century)
Coarse 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