Definition
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
Hawaiite is volcanic rock that resembles basalt. It is an olivine basalt with intermediate composition between alkali olivine and mugearite
History
Origin
Pennsylvania, U.S.
Hawaii Islands
Discoverer
Unknown
Joseph Iddings
Etymology
From Greek anthrakites, from anthrax, anthrak meaning coal
From Hawaii Islands
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Opaque Rock