Definition
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
Hyaloclastite is an aggregate of fine, glassy debris formed by the sudden contact of hot, coherent magma and cold water or water-saturated sediment
History
Origin
Hawaii Islands
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Discoverer
Unknown
Unknown
Etymology
From Greek pikros bitter + -ite, 19th century
From hyalo + -ite
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Family
Group
Volcanic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock