Tough choice today for #MinCup23 Both are gorgeous and no matter which one wins, it’s a blue mineral! My choice for today is trusty index mineral #kyanite which always gives me a clue to how a rock was formed. And it has different hardness depending on which direction you scratch it (insert your own naughty joke about hardness here). https://www.mineralcup.org/2023/campaigns/round-1-match-15

Photo found on Mindat.org so check out more photos there