Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
Migmatite is typically a granitic rock within a metamorphic host rock which is composed of two intermingled but distinguishable components
History
Origin
Pennsylvania, U.S.
Southern Alps, France
Discoverer
Unknown
Jakob Sederholm
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
From the Greek word migma which means a mixture
Class
Metamorphic Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
-
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock