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I've been falling behind with my #MinCup23 tweets 😬 Today's match is arsenuranospathite vs neptunite and the latter is getting my vote. It's a silicate #mineral named after Neptune, the Roman god of the sea. It's often found together with white natrolite, and they look so good together! Here's one on display in the NHM London

Vote for your favourite here: https://www.mineralcup.org/2023/campaigns/round-1-match-14
An elongate slab of rock with a bumpy coating of white natrolite which resembles snow. There are black pointy crystals of neptunite of varying sizes spread across the natrolite.