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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
Metapelite is an old and currently not widely used field geological term for a clay rich fine-grained clastic sediment or sedimentary rock, i.e. mud or a mudstone
From Pelos or clay in Greek
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock