Definition
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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
Greenschist is a metamorphic rock that is formed under lowest temperatures and pressures and is usually produced by regional metamorphism
From minerals such as chlorite, serpentine, and epidote, and platy minerals such as muscovite and platy serpentine which are green in color
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock