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Carbonatite is intrusive or extrusive igneous rock which is defined by mineralogic composition, consisting of greater than 50 percent carbonate minerals
From any intrusive igneous rock, having a majority of carbonate minerals
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Phonolite is an uncommon extrusive igneous rock volcanic rock of intermediate chemical composition between felsic and mafic
From the Greek meaning sounding stone because of the metallic sound it produces if an unfractured plate is hit
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock