| 词汇 | haematite |
| 释义 | haematite noun[ U ] geology UKspecialized(UShematite)uk /ˈhiː.mə.taɪt/ us /ˈhiː.mə.taɪt/ a common dark red or grey rock from which iron is obtained赤铁矿（深红或灰色的常见矿石，可提炼出铁） RHJ/iStock/Getty Images Plus/GettyImages Geology: types of rock agglomerate arenaceous arenite asthenosphere asthenospheric emery flinty gneiss indurated intrusive lahar limestone lodestone magma marcasite marl marmoreal obsidian sandstone schist Examples of haematitehaematite This study concentrates on the latter which contain abundant chlorite-rich layers, commonly rich in magnetite and haematite grains. The red colour of the dolomite is due to abundant haematite crystallites that grew in the dolomite crystal fabric. Thus, dolomite vein formation and haematite precipitation were two distinct events, which likely record different conditions. Rather, haematite precipitation postdated the dolomite and took advantage of the dolomite crystal fabric. The nodules are dispersed throughout a clay and haematite-rich matrix. In addition, haematite is commonly present, to locally abundant. The calcination of haematite from a lower to a higher temperature could be used to monitor the water content in the lattice. These observations indicate that the dolomite and haematite were not precipitated as two coeval minerals. The pink colour is the product of haematite staining of the crinoid ossicles prior to growth of the syntaxial cement. The magnetization in the veins, schist and sandstones is interpreted to have been acquired when the haematite was precipitated. This is supported by petrographic studies of these samples that revealed skeletal magnetite with borders altered to haematite. Where the schist is reddened around the dolomite veins, the reddened portions similarly contain an intermixture of dolomite and haematite. These haematite-rich 'berries ' weather out of the rock and are strewn across the surface. This is supported by the presence of authigenic haematite. Depending on the particle size, haematite has been categorized as red (grain diameter less than 10 mm) and grey (grain diameter over 10 mm). See all examples of haematite These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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