Definition
Origin
Discoverer
Etymology
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Other Categories
Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities
From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock
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