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Bluestones are bluish volcanic rocks of spotted dolerite found in West Wales.
A precipitous dolerite crag forms the perfect defence on the two seaward sides of the castle.
The peaks are resistant "spires" of Jurassic dolerite, lying over older rocks of Triassic-Permian sediments.
Dr Gibb is a specialist in igneous rocks who has done mould-breaking research into the beautiful columnar dolerites of the Hebrides.
These observations can be explained by the fact that felsic granulite requires more fluid infiltration to equilibrate than mafic granulite and dolerite.
Subangular to subrounded fragments of basalt and dolerite of boulder to granule sizes are contained in a red granule matrix.
Thin-section analysis of one rock sample identified it as a dolerite.
The basalt and dolerite groups are geochemically indistinguishable and may be treated as a single sample set.
The breccias consist mainly of bottle-green basalt and dolerite rubble mixed with subordinate amounts of reddish, finegrained matrix.
Dolerite is relatively poor in silicon and rich in minerals, and after chemical weathering doleritic soils have high clay contents.
Despite the high temperatures of the igneous intrusion, carbon has been preserved at the dolerite-shale contact and in shale enclaves where partial melting of the shale has occurred.
Although they appear to be of abiogenic origin, only that near the dolerite sills points to a probable mantle origin.
The lighthouse was built by convict labour using locally-quarried dolerite over two years.
The dolerite is believed to have existed as much as 1/2 billion years before the meteorite impact.
The pebbles are mostly quartzite, but include dolerite and agate.
Dolerite is intrusive and is relative to basalt (extrusive).
The peak is sandstone with dolerite intrusions and is a sharp summit ridge.
Sediments are up to 500 meters thick, with the lowest layers consisting of dolerite boulders.
Dolerite is composed of an intrusive volcanic rock of plagioclase feldspar that is harder than granite.
