TIL that the gemstone jet, where the phrase 'jet black' comes from, is actually a form of coal. en.wikipedia.org Submitted by ih8pkmn t3_1157pdm on February 18, 2023 at 5:21 AM in todayilearned 13 comments 201
holycannoli1738 t1_j90bu2w wrote on February 18, 2023 at 6:37 AM TIL about the origin of “jet black” Permalink 2
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