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Ijolite is an intrusive igneous rock which is composed mainly of nepheline and an alkali pyroxene, usually aegirine-augite
From the first syllable of the Finnish words Ii-vaara, Iijoki, &c. commonly used geographical names in Finland, and the Gr. Xiflos, a stone
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Opaque Rock
A sedimentary rock, deposit of a submarine turbidity currents and are composed of layered particles
From Medieval Latin turbiditas, from Latin turbidus (turbid). Turbidity current is from 1939
Coarse Grained Rock, Fine Grained Rock, Opaque Rock