Thuringite
Thu`rin´gite
n. | 1. | (Min.) A mineral occurring as an aggregation of minute scales having an olive-green color and pearly luster. It is a hydrous silicate of aluminia and iron. |
单词 | thuringite | |||
释义 | ThuringiteThu`rin´gite
ThuringiteThuringitea mineral of the oxidized chlorite (leptochlorite) group with a complex, varying composition. The approximate formula is (Fe2+, Fe3+)3[Al2Si2O10] (OH)2(Mg, Fe)3(OH)6. Thuringite crystallizes in the monoclinic system. It usually forms compact, fine-grained masses but sometimes occurs as minute, readily separable flexible scales having a pearly luster and pronounced pleochroism. Hardness on Mohs’ scale varies from 2 to 2.5, and the density is 3,150–3,190 kg/m3. The mineral has perfect (001) cleavage. Thuringite can be identified only by using a number of diagnostic methods. In its largest accumulations, it forms a valuable component in the sedimentary deposits of iron ore; it is also formed during the metamorphosis of iron-rich quartzites and the hydrothermal alteration of iron-rich silicates in magmatic rock. The largest known deposits of thuringite are in Thuringia (German Democratic Republic). |
|||
随便看 |
英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。