also: むらさきせきえい
noun
Mineralogy term for the purple variety of quartz.
紫石英は紫色の水晶の一種です。
Amethyst is a type of purple quartz.
Common loanword for amethyst, used in everyday and jewelry contexts, while 紫石英 is a technical mineralogy term.
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.