Definition
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Shale is a fine-grained sedimentary rock which is formed by the compaction of silt and clay-size mineral particles
History
Origin
Italy
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Discoverer
Unknown
Johann Gottlob Lehmann
Etymology
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
From German Schalstein laminated limestone, and Schalgebirge layer of stone in stratified rock. From Old English scealu in its base sense of- thing that divides or separate,
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
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Other Categories
Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock