dolerite colour

Diabase (dolerite) is a dark-colored igneous rock.
Dolerite is a volcanic rock. It was first defined by a French geologist Alexandre Brongniart in 1807. The St. Mary’s Island Sandstone, near St. Mary’s Island, Whitley Bay, Northumberland. Diabase with notable plagioclase phenocrysts from La Palma, Canary Islands. Dating from the Carboniferous period, this rock is approximately 350 million years old; it is often packed with marine fossils, including brachiopod shells, corals and crinoids. These two terms are synonymous. A contact between basalt (on the left) and dolerite in Cyprus. The width of the view is 9 cm. Apatite pebbles found near St. Mary’s Island, Whitley Bay. Brongniart named so rocks that were composed of feldspar and hornblende. Diabase, also called Dolerite, fine- to medium-grained, dark gray to black intrusive igneous rock. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap. Text TWAM 3 to give £3, TWAM 5 to give £5 or TWAM 10 to give £10 to 70085. Diabase is a common rock type. While similar to basalt, it contains crystals which can be seen with a hand lens. It is chiefly composed of a hard dark grey/black rock known as quartz dolerite that is used as road stone and extracted at several sites, including Barrasford Quarry near Hexham. • A dolerite is the medium-grained equivalent of a basalt - a basic rock dominated by plagioclase and pyroxene. Typically it is found in volcanic plugs which channeled the basalt to the surface. These include Tievebulliagh, Corkey Rocks, Scawt Hill, Ballygalley Head and Sandy Braes, all in County Antrim. Hi, my name is Sylvia, I’m the geologist at the Great North Museum: Hancock.

Differences in texture can be useful identification aids: compared to the crystalline Whin Sill, the black limestones have a much finer texture, and a duller, more muddy appearance. Quartz pebbles are typically opaque to translucent, coloured yellow, brown, orange or white, and stand out from the sand when wet. Dolerite is a dark igneous rock.

Depending on how the crinoid fossils sit within a pebble, they can resemble rows of teeth. Quartz dolerite pebble, the white spots consist largely of the mineral calcite. Iron-rich sandstones and finer-grained sedimentary rocks are typically described as ironstone and have a distinctive brown or more vivid orange or ochre colour. Crinoid ‘stem’ preserved in limestone, on the beach near Bamburgh, Northumberland. It is compositionally equivalent to gabbro and basalt but texturally between them. It was Brongniart himself who decided to abandon the term in 1827.


Typically it is found in volcanic plugs which channeled the basalt to the surface. Like other mafic rocks, it is relatively low in silica content. The term “diabase” has a long and complicated history. The term “microgabbro” is sometimes used to refer to such rocks. The width of the view is 14 cm. The mineral Apatite is composed largely of calcium phosphate, just like our teeth. Sheeted dikes in Cyprus are composed of dolerite. Copyright 2020 Tyne & Wear Archives & Museums. Diabase is composed of plagioclase feldspar (mostly labradorite) and pyroxene (augite).

Loose crinoids are sometimes found in beach sand, for example on Lindisfarne; they are known locally as St. Cuthbert’s beads – some crinoids have a hole through the middle and have been used to make rosaries. It grades to basalt when it solidifies rapidly and to gabbro when more time is given to the crystals to grow.

Diabase is a common rock type.

The Isle of Mull, Scotland. It is chiefly composed of a hard dark grey/black rock known as quartz dolerite that is used as road stone and extracted at several sites, including Barrasford Quarry near Hexham. It may take a while to ‘get your eye in’ and spot the apatite among the beach pebbles, but some pieces are so clear that they can be confused with green sea glass and have been used to make jewellery.

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