Definition
Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
USA, Australia
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Discoverer
Tornebohm
Alexandre Brongniart and René Just Haüy
Etymology
From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.
From Greek trakhus rough’ or trakhutēs roughness
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock