Mineraldle
Puzzle #56 was cummingtonite.
Cummingtonite is a metamorphic amphibole with the chemical composition (Mg,Fe2+)2(Mg,Fe2+)5Si8O22(OH)2, magnesium iron silicate hydroxide.
What the record says
Puzzle 56 ran on 9 Sep 2026 and the answer was cummingtonite, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - silicates; Elements - H, Mg, O, Si; Named after - place.
Beyond the grid the record adds Formula - ☐Mg₂Mg₅Si₈O₂₂(OH)₂; Named after - Cummington.
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
- silicates
- Elements
- H, Mg, O, Si
- Named after
- place
Also on the record
- Formula
- ☐Mg₂Mg₅Si₈O₂₂(OH)₂
- Named after
- Cummington