Mineraldle
Puzzle #50 was celadonite.
Celadonite is a mica group mineral, a phyllosilicate of potassium, iron in both oxidation states, aluminium and hydroxide with formula K(MgFe3+â—»)(Si4O10)(OH)2.
Read about it on Wikipedia →
What the record says
Puzzle 50 ran on 3 Sep 2026 and the answer was celadonite, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - silicates; Named after - other. 1 of the 4 columns is blank in the source (Elements), so nobody could score it either way.
Beyond the grid the record adds Mohs hardness - 2; Named after - celadon.
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
- Not recorded
- Named after
- other
Also on the record
- Mohs hardness
- 2
- Named after
- celadon