Mineraldle
Puzzle #53 was achávalite.
Achávalite is a selenide mineral that is a member of the nickeline group. It has only been found in a single Argentinian mine system, being first discovered in 1939 in a selenide deposit. The type locality is Cacheuta mine, Sierra de Cacheuta, Mendoza, Argentina.
What the record says
Puzzle 53 ran on 6 Sep 2026 and the answer was achávalite, played with 6 guesses against 4 columns. On the record: Crystal system - hexagonal; Strunz group - sulfides-sulfosalts; Elements - Fe, Se. 1 of the 4 columns is blank in the source (Named after), so nobody could score it either way.
Beyond the grid the record adds Formula - FeSe.
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
- hexagonal
- Strunz group
- sulfides-sulfosalts
- Elements
- Fe, Se
- Named after
- Not recorded
Also on the record
- Formula
- FeSe