Definition
Websterite is ultramafic and ultrabasic rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a special type of pyroxenite.
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Webster, North Carolina
-
Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From the town of Webster located in North Carolina
From Greek trakhus rough’ or trakhutēs roughness
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock