Definition
Scoria is a dark-colored extrusive igneous rock with abundant round bubble-like cavities
Cataclasite is a type of cataclastic rock that is formed by fracturing and comminution during faulting. It is normally cohesive and non-foliated, consisting of angular clasts in a finer-grained matrix
History
Origin
-
Swiss Alps, Europe
Discoverer
Unknown
Michael Tellinger
Etymology
From late Middle English (denoting slag from molten metal), from Greek skōria refuse, from skōr dung
From the Italian word cataclasi
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock