Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
History
Origin
Italy
Germany
Discoverer
Unknown
Van Tooren
Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
From Greek tephra, ashes from Indo-European base, to burn
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Volcanic
Other Categories
Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock