Bournonite
Bour´non`ite
| n. | 1. | (Min.) A mineral of a steel-gray to black color and metallic luster, occurring crystallized, often in twin crystals shaped like cogwheels (wheel ore), also massive. It is a sulphide of antimony, lead, and copper. |
| 单词 | bournonite | |||
| 释义 | BournoniteBour´non`ite
Bournonitebournonite[′bür·nə‚nīt]Bournonite(named for the French mineralogist J. L. Bournon, 1751-1825), a mineral of the complex sulfide group. Its chemical composition is CuPbSbS3, with occasional admixtures of iron (to 5 percent) and silver (to 3 percent). Bournonite crystallizes in a rhomboidal system, forming thick columnar crystals or complex wheel-shaped twins. The color ranges from steely gray to iron black. Its hardness on the mineralogical scale is 3.0-3.5, and its density is 5, 800-5, 900 kg/m3. It associates with tetrahedrite, pyrite, chalcopyrite, galenite, and sphalerite in complex forms of cupric polymetallic hydrothermal deposits. Upon weathering, bournonite forms cerussite, malachite, and antimonic ochers. Deposits of bournonite occur in the USSR (Middle Asia, Transbaikalia, and other areas). Abroad, there are deposits in Australia and some South American countries (Chile, Peru, and Bolivia). Bournonite is used to obtain lead and copper. |
|||
| 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。