Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine
History
Origin
Germany
Hawaii Islands
Discoverer
Van Tooren
Unknown
Etymology
From Greek tephra, ashes from Indo-European base, to burn
From Greek pikros bitter + -ite, 19th century
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock