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dolerite

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
dol·er·ite  (dl-rt)
n. Chiefly British
A dark, fine-grained igneous rock; diabase.

[French dolérite, from Greek doleros, deceitful (from its easily being mistaken for diorite), from dolos, trick; see del-2 in Indo-European roots.]

doler·itic (-rtk) adj.

dolerite [ˈdɒləˌraɪt]
n
1. (Earth Sciences / Geological Science) a dark basic intrusive igneous rock consisting of plagioclase feldspar and a pyroxene, such as augite; often emplaced in dykes
2. (Earth Sciences / Geological Science) any dark igneous rock whose composition cannot be determined with the naked eye
[from French dolérite, from Greek doleros deceitful; so called because of the difficulty of determining its composition]
doleritic  [ˌdɒləˈrɪtɪk] adj

dolerite  (dl-rt)
See diabase.


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The stone, made of Preseli Spotted Dolerite - a chemically altered igneous rock which is harder than granite - were mined in the Preseli Mountains in Pembrokeshire and dragged and floated 200 miles to the site on the banks of the river.
The stones, made of Preseli spotted dolerite, were mined in the Preseli Mountains.
A second area that contains igneous rock lies at Whin Sill, on which Hadrians Wall stands, an interruption of carboniferous Dolerite.
 
 
 
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