Dolerite


Dolerite is a dark igneous rock.

It is a mafic rock, containing magnesium and iron, often in form of olivine. Like other mafic rocks, it is relatively low in silica content.





It is a medium grained igneous rock, and can be dark grey or black with greenish shades in colour.

Minerals in this rock include olivine, plagioclase feldspar, pyroxene, quartz and sometimes ilmenite, biotite, hornblende and magnetite.

 dolerite
 Dolerite. By Oor Woolie via Flickr.com

It often forms in basaltic provinces as sills and dykes, (which are igneous intrusions).

 dolerite rock 
 
By brewbooks via Flickr.com

Some of the most famous occurences are in New Jersey in The US (the famous Palisades), at Lake Superior in Canada, in north-east England (as well as the
famous ancient stone circle Stonehenge!), and on the Tasmanian island in Australia.












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