Diabase
(Redirected from Dolerite)
Diabase (also known as dolerite or microgabbro[1]) is an igneous rock that is often blue in colour. It is rich in magnesium and iron. Dikes and sills in igneous rock are often made of diabase.
Diabase is mostly a silicate feldspar known as labradorite (about 40% to 70%). Most of the rest is pyroxene minerals (usually augite). Small amounts of hornblende, olivine, magnetite, and quartz are in some diabase rocks.
Diabase Media
Fair Head, Northern Ireland
Diabase boulders at Devil's Den on the Gettysburg Battlefield, Pennsylvania, US
Dolerite rocks and Quiver trees near Keetmanshoop (Namibia)
Dolerite forms tall vertical columns throughout Tasmania. These columns form steep vertical features through its alpine areas.
References
- ↑ "BGS Rock Classification Scheme - Dolerite (synonymous with Microgabbro)". British Geological Survey. Retrieved 24 August 2015.