Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Granodiorite is a coarse-grained intrusive igneous rock containing quartz and plagioclase, and which has composition in between granite and diorite
History
Origin
Hawaii Islands
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Discoverer
Unknown
Unknown
Etymology
From Greek pikros bitter + -ite, 19th century
From granite + diorite
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Medium Grained Rock, Opaque Rock