Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava
History
Origin
Hawaii Islands
North America
Discoverer
Unknown
Theodor von Gümbel
Etymology
From Greek pikros bitter + -ite, 19th century
From Andes mountains, where it is found in abundance
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock