Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature
History
Origin
Pennsylvania, U.S.
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Discoverer
Unknown
René Just Haüy
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
From French, Greek eklogē selection with reference to the selective content of the rock + -ite1
Class
Metamorphic Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock