请输入您要查询的英文单词:

 

单词 norite
释义

norite


nor·ite

N0152900 (nôr′īt)n. See gabbro.
[Norwegian Norge, Norway + -ite.]
nor·it′ic (nô-rĭt′ĭk) adj.

norite

(ˈnɔːraɪt) n (Geological Science) a variety of gabbro composed mainly of hypersthene and labradorite feldspar[C19: from Norwegian norit, from Norge Norway + -it -ite1]

Norite


norite

[′nȯ‚rīt] (petrology) A coarse-grained plutonic rock composed principally of basic plagioclase with orthopyroxene (hypersthene) as the dominant mafic material. Also known as hypersthenfels.

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.

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。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2025/3/4 11:22:09