Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature
History
Origin
Hawaii Islands
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Discoverer
Unknown
René Just Haüy
Etymology
From Greek pikros bitter + -ite, 19th century
From French, Greek eklogē selection with reference to the selective content of the rock + -ite1
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock