Mineraldle
Puzzle #109 was althausite.
Althausite is a relatively simple magnesium phosphate mineral with formula Mg2(PO4)(OH,F). It is very rare. Original occurrences are magnesite deposits among serpentinites.
What the record says
Puzzle 109 ran on 1 Nov 2026 and the answer was althausite, played with 6 guesses against 4 columns. On the record: Crystal system - orthorhombic; Strunz group - phosphates-related; Elements - F, H, Mg, O, P. 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 - Mg₄(PO₄)₂(OH,O)(F,☐).
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
- orthorhombic
- Strunz group
- phosphates-related
- Elements
- F, H, Mg, O, P
- Named after
- Not recorded
Also on the record
- Formula
- Mg₄(PO₄)₂(OH,O)(F,☐)