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