Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism
History
Origin
Italy
England
Discoverer
Unknown
Abraham Gottlob Werner
Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
From Old French esclate, from esclat (French éclat)
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
-
Other Categories
Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock