Definition
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
Ignimbrite is a volcanic rock consisting mainly of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows
History
Origin
Germany
New Zealand
Discoverer
Christian Leopold von Buch
Patrick Marshall
Etymology
From Latin glaber bare, smooth, bald
From Latin ignis fire + imber, imbr- shower of rain, storm cloud + -ite
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock