Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Wehrlite is an ultramafic and ultrabasic rock that is a mixture of olivine and clinopyroxene. It is a subdivision of the peridotites
History
Origin
-
Egypt
Discoverer
Alexandre Brongniart and René Just Haüy
Alois Wehrle
Etymology
From Greek trakhus rough’ or trakhutēs roughness
From the name of a professor, Alois Wehrle
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock