Boninite is a mafic extrusive rock which is high in magnesium and silica content, formed in fore-arc environments, typically during the early stages of subduction
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 its occurrence in the Izu-Bonin arc south of Japan
From Concha (Latin)+ Coquina(Spanish) +conch(English)= Couquina (mid 19th century)
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock