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Diabase (/ ˈ d aɪ. ə ˌ b eɪ s /), also called dolerite (/ ˈ d ɒ l. ə ˌ r aɪ t /) or microgabbro, [1] is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro.
Dolomite (/ ˈ d ɒ l. ə ˌ m aɪ t, ˈ d oʊ. l ə-/) is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally CaMg(CO 3) 2. The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite (see Dolomite (rock) ).
The components of the Togari Group are called Forest Conglomerate and Quartzite, Black River Dolomite, Kanunnah subgroup (containing the lavas) and Smithton Dolomite. [4] These rocks are important for determining the boundary between the Cryogenian and Ediacaran periods as they contain volcanics that can be dated and dolomites marking the end ...
The Northern English/Scots term whin is first attested in the fourteenth century, and the compound whinstone from the sixteenth. [2] The Oxford English Dictionary concludes that the etymology of whin is obscure, though it has been claimed, fancifully, that the term 'whin' derives from the sound it makes when struck with a hammer.
Mudstone on east beach of Lyme Regis, England. Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds.Mudstone is distinguished from shale by its lack of fissility.
Southern Limestone-Dolomite Valleys & Low Rolling Hills ecoregion (67f, medium-dark orange) coursing through the states of Virginia, Tennessee, Georgia and Alabama.. The Southern Limestone/Dolomite Valleys & Low Rolling Hills (Ecoregion 67f) is one of the 99 Level IV ecoregions in the continental United States, as defined by a collaboration between the EPA, USGS and USDA. [1]
Many are intergrown with other minerals, such as calcite and dolomite. The basic structural unit of serpentine is a polar layer 0.72 nm thick. A Mg -rich trioctahedral sheet is tightly linked on one side to a single tetrahedral silicate sheet , regardless of the 3–5% larger lateral lattice dimensions of the octahedral sheet . [ 10 ]
The Prospect dolerite intrusion, or Prospect intrusion, is a Jurassic picrite or dolerite laccolith that is situated in Sydney, New South Wales, Australia. [2] Lying in the heart of Cumberland Plain, in the suburb of Pemulwuy (previously Greystanes), the intrusion is Sydney's largest body of igneous rock, rising to a height of 117 metres (384 ft) above sea level. [3]