Definition
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature
History
Origin
Germany
USA
Discoverer
Christian Leopold von Buch
Edgar Bailey
Etymology
From Latin glaber bare, smooth, bald
From French schiste, Greek skhistos i.e. split
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
-
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock