Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
History
Origin
Hawaii Islands
Pennsylvania, U.S.
Discoverer
Unknown
Unknown
Etymology
From Greek pikros bitter + -ite, 19th century
From Greek anthrakites, from anthrax, anthrak meaning coal
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock