Linarite is a somewhat rare, crystalline mineral that is known among mineral collectors for its unusually intense, pure blue color. (Source)
Good afternoon/morning ! I hope you're doing great. As seen before, I'm also a follower of yours but I'm actually reblogging on my side blog aka patator-fetcher. Might be useful for the giveaway. Thanks a lot for all the beautiful content you share with us ! Cheers, a fellow minerals collector.