Definition
Essexite which is also known as nepheline monzogabbro, is a dark gray or black holocrystalline plutonic Iigneous Rock
Sovite is a coarse-grained variety of carbonatite which belongs to intrusive igneous rock
History
Origin
USA
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Discoverer
Unknown
Unknown
Etymology
From the locality in Essex County, Massachusetts,US
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Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Family
Group
Plutonic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock