Mineraldle
Puzzle #77 was franklinite.
Franklinite is an oxide mineral belonging to the normal spinel subgroup's iron (Fe) series, with the formula ZnFe3+2O4.
What the record says
Puzzle 77 ran on 30 Sep 2026 and the answer was franklinite, played with 6 guesses against 4 columns. On the record: Crystal system - cubic; Strunz group - oxides-hydroxides; Elements - Fe, O, Zn; Named after - other.
Beyond the grid the record adds Formula - ZnFe³⁺₂O₄; Named after - Franklin.
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
- cubic
- Strunz group
- oxides-hydroxides
- Elements
- Fe, O, Zn
- Named after
- other
Also on the record
- Formula
- ZnFe³⁺₂O₄
- Named after
- Franklin