Mineraldle
Puzzle #13 was chalcanthite.
Chalcanthite (from Ancient Greek χάλκανθον (khálkanthon), from χαλκός (khalkós) 'copper' and ἄνθος (ánthos) 'flower, bloom') is a richly colored blue-green water-soluble sulfate mineral CuSO4·5H2O. It is commonly found in the late-stage oxidation zones of copper deposits. Due to its ready solubility, chalcanthite is more common in arid regions.
Read about it on Wikipedia →
What the record says
Puzzle 13 ran on 28 Jul 2026 and the answer was chalcanthite, played with 6 guesses against 4 columns. On the record: Crystal system - triclinic; Strunz group - sulfates-related; Elements - Cu, H, O, S; Named after - other.
Beyond the grid the record adds Formula - CuSO₄·5H₂O; Named after - copper, flower.
Mineraldle builds its record from Wikidata - CC0 1.0. The description above comes from the same place the game credits on every reveal: English Wikipedia verbatim extract, CC BY-SA 4.0. The puzzle itself is still playable in the archive, and every answer that has been and gone is listed on the past-answers page.
How it scored
- Crystal system
- triclinic
- Strunz group
- sulfates-related
- Elements
- Cu, H, O, S
- Named after
- other
Also on the record
- Formula
- CuSO₄·5H₂O
- Named after
- copper, flower