Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Italy
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Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
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
Volcanic
Volcanic
Other Categories
Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock