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Marble is a non-foliated metamorphic rock which is composed of recrystallized carbonate which is formed when limestone is exposed to high temperatures and pressures over a long time
From the Greek marmaros, shining stone and also from the English word marmoreal meaning marble-like
Durable Rock, Medium Hardness Rock
Medium Grained Rock, Opaque Rock
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
From Greek anthrakites, from anthrax, anthrak meaning coal
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock