Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
Rhomb-porphyry is a porphyritic igneous rock with abundant wedge or lens shaped anorthoclase or feldspar phenocrysts
From Latin term that means purple
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock
Icelandite belongs to volcanic igneous rocks which is rich in iron and belongs to andesite rock
From its origin place near Cenozoic volcano near the parsonage Þingmúli in East Iceland
Fine Grained Rock, Opaque Rock