A prefix attached to the name of an igneous rock when the rock has a darker colour than is usual. For example, a syenite which is darker than normal is called a ‘melasyenite’.
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。