A twinned crystal (see crystal twinning) where the twin axis lies in the composition plane parallel to a zone axis, e.g. a Carlsbad twin in orthoclase feldspar.
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。