noun, noun which may take the genitive case particle 'no'
fluorite; fluorspar
A common mineral (calcium fluoride) used in industry and as a gemstone. The Japanese name literally means 'firefly stone' because some specimens glow when heated.
蛍石はフッ化カルシウムからなる鉱物です。
Fluorite is a mineral composed of calcium fluoride.
この蛍石の結晶は美しい紫色をしている。
This fluorite crystal has a beautiful purple color.
Variant kanji form using 螢 (kyūjitai of 蛍); rarely encountered.
English loanword for fluorite; used in some technical or gemstone contexts, but 蛍石 is the standard Japanese term.
Compound of 蛍 (hotaru, 'firefly') and 石 (ishi, 'stone'), from the mineral's property of glowing when heated or under ultraviolet light. The reading けいせき is the on'yomi version, less common.