quartz
https://gyazo.com/6c6d77d5107925628d3d6b8972a9b2e2
source: By JJ Harrison (https://www.jjharrison.com.au/) - Own work, CC BY-SA 2.5
noun
a hard white or colorless mineral consisting of silicon dioxide, found widely in igneous, metamorphic, and sedimentary rocks. It is often colored by impurities (as in amethyst, citrine, and cairngorm).
〘鉱〙 石英, 水晶, クォーツ〘電子部品や時計に利用される〙
ORIGIN
mid 18th century: from German Quarz, from Polish dialect kwardy, corresponding to Czech tvrdý ‘hard’.