Definition
Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
New Zealand
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Discoverer
Ferdinand von Hochstetter
Alexandre Brongniart and René Just Haüy
Etymology
From the name of Dun Mountain, New Zealand, + -ite1
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
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock