Mineraldle
Puzzle #100 was akrochordite.
Akrochordite is a rare hydrated arsenate mineral with the chemical formula (Mn,Mg)4(AsO4)2(OH)4·4H2O and represents a small group of rare manganese (Mn) arsenates and, similarly to most other Mn-bearing arsenates, possess pinkish colour. It is typically associated with metamorphic Mn deposits.
What the record says
Puzzle 100 ran on 23 Oct 2026 and the answer was akrochordite, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - phosphates-related; Elements - As, H, Mn, O. 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 - Mn²⁺₅(AsO₄)₂(OH)₄·4H₂O.
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
- As, H, Mn, O
- Named after
- Not recorded
Also on the record
- Formula
- Mn²⁺₅(AsO₄)₂(OH)₄·4H₂O