Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
Rhyolite is a fine-grained igneous rock which is rich in silica
From German Rhyolit, from Greek rhuax lava stream + lithos stone
Coarse Grained Rock, Opaque Rock
Theralite is a plutonic hylocrystalline igneous rock consisting of augite, olivine, calcic plagioclase and nepheline
Fine Grained Rock, Opaque Rock