A little-used term to describe the normative ferromagnesian minerals in a rock. The CIPW normative components hypersthene (Hy), diopside (Di), fayalite (Fa), and forsterite (Fo) are all femic components of a rock.
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。