It was found that the schorl or dravite in schorl - dravite group that is produced from pegmatite and has good crystal degree had a strong intensity of spontaneous polarity by electron - beam bombardment and x - ray diffraction of varying the temperature 利用电子束轰击结合变温xrd分析发现在schorl - dravite系列电气石中，产于伟晶岩的，结晶度比较高的mg电气石或fe电气石具有较高的自发极化强度。
