Definition
Origin
Discoverer
Etymology
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Other Categories
Jasperoid is a rare, peculiar type of metasomatic alteration of rocks
From silica, the main mineral content of Jasperoid
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy
Medium Grained Rock, Opaque Rock