请输入您要查询的字词:

 

单词 pyrochlore
释义
pyrochlore

Geology and Earth Sciences
  • Mineral oxide (Na,Ca,U)2(Nb,Ta,Ti)2O6 (OH,F); sp. gr. 4.3–4.5; hardness 5.0–5.5; cubic; normally brown to black, green when heated; light brown streak; vitreous to greasy lustre; crystals usually octahedra or irregularly shaped grains; cleavage octahedral when present; found in granitic rocks and pegmatites, with or near alkaline rocks, and in association with zircon, apatite, and carbonatites. The calcium and sodium in the crystal lattice can be substituted with uranium, thorium, or the rare-earth elements.


随便看

 

科学参考收录了60776条科技类词条,基本涵盖了常见科技类参考文献及英语词汇的翻译,是科学学习和研究的有利工具。

 

Copyright © 2000-2023 Sciref.net All Rights Reserved
京ICP备2021023879号 更新时间:2024/12/25 13:09:48