Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Marble is a non-foliated metamorphic rock which is composed of recrystallized carbonate which is formed when limestone is exposed to high temperatures and pressures over a long time
History
Origin
Hawaii Islands
Egypt
Discoverer
Unknown
Unknown
Etymology
From Greek pikros bitter + -ite, 19th century
From the Greek marmaros, shining stone and also from the English word marmoreal meaning marble-like
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Opaque Rock
Medium Grained Rock, Opaque Rock