Definition
Ignimbrite is a volcanic rock consisting mainly of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
New Zealand
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Discoverer
Patrick Marshall
Alexandre Brongniart and René Just Haüy
Etymology
From Latin ignis fire + imber, imbr- shower of rain, storm cloud + -ite
From Greek trakhus rough’ or trakhutēs roughness
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock