Definition
Chert is a hard, dark, opaque sedimentary rock which is composed of silica with an amorphous fine-grained texture
Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine
History
Origin
-
New Zealand
Discoverer
Unknown
Ferdinand von Hochstetter
Etymology
From flint-like quartz, 1670s, of unknown origin- a local term, which has been taken into geological use
From the name of Dun Mountain, New Zealand, + -ite1
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock