Definition
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Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation
From French schiste, Greek skhistos i.e. split
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle
From French, from peridot + -ite
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Opaque Rock