Mineraldle
Puzzle #51 was volborthite.
Volborthite is a mineral containing copper and vanadium, with the formula Cu3V2O7(OH)2·2H2O. Found originally in 1838 in the Urals, it was first named knaufite but was later changed to volborthite for Alexander von Volborth (1800–1876), a Russian paleontologist.
Read about it on Wikipedia →
What the record says
Puzzle 51 ran on 4 Sep 2026 and the answer was volborthite, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - phosphates-related; Elements - Cu, H, O, V; Named after - person.
Beyond the grid the record adds Formula - Cu₃V₂O₇(OH)₂·2H₂O; Named after - Alexander von Volborth.
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
- monoclinic
- Strunz group
- phosphates-related
- Elements
- Cu, H, O, V
- Named after
- person
Also on the record
- Formula
- Cu₃V₂O₇(OH)₂·2H₂O
- Named after
- Alexander von Volborth