Definition
Gossan is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein.
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Indonesia
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Discoverer
Cornish Gossen
Alexandre Brongniart and René Just Haüy
Etymology
From Cornish gossen from gos, blood from Old Cornish guit
From Greek trakhus rough’ or trakhutēs roughness
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Volcanic
Other Categories
Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock