An igneous rock that consists almost entirely of ferromagnesian minerals and possesses no free quartz, and with less than 45% silica (SiO2). ‘Ultramafic’ is a partial synonym.
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。