| 单词 | norite |
| 释义 | noritenor·iteN0152900 (nôr′īt)norite(ˈnɔːraɪt)Noritenorite[′nȯ‚rīt]Norite(Norwegian norit, from Norge, “Norway”), a rock of basic composition in the gabbro group. It differs from gabbro in that it contains a rhombic pyroxene, usually bronzite but sometimes enstatite and hypersthene. When both pyroxenes are present the rock is called gabbro-norite. The remaining minerals are those in gabbro. Plagioclase with more than 50 percent anorthite predominates; olivine is often present; and various ore minerals such as magnetite, titanmagnetite, and sulfides occur as insignificant impurities. Norite typically has a low SiO2 content (45–55 percent), significant amounts of Mg and Ca (10–20 percent), and a negligible alkali content (rarely more than 2–3 percent). It is used as a building material. |
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