Definition
Hawaiite is volcanic rock that resembles basalt. It is an olivine basalt with intermediate composition between alkali olivine and mugearite
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Hawaii Islands
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Discoverer
Joseph Iddings
Alexandre Brongniart and René Just Haüy
Etymology
From Hawaii Islands
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
Opaque Rock
Fine Grained Rock, Opaque Rock