also: むらさきせきえい
Amethyst is a type of purple quartz.
Standard kanji spelling for amethyst in mineralogy contexts.
Kun-yomi reading; less common but still used, especially in explanatory or educational contexts.
Compound of 紫 (むらさき, 'purple') and 石英 (せきえい, 'quartz'). The reading しせきえい uses the on-yomi for 紫.