Mineraldle
Puzzle #31 was hafnon.
Hafnon is a hafnium nesosilicate mineral with the idealized chemical formula HfSiO4. It is the mineral form of hafnium silicate and one of the few known minerals with essential hafnium.
Read about it on Wikipedia →
What the record says
Puzzle 31 ran on 15 Aug 2026 and the answer was hafnon, played with 6 guesses against 4 columns. On the record: Crystal system - tetragonal; Strunz group - silicates; Elements - Hf, O, Si; Named after - other.
Beyond the grid the record adds Formula - HfSiOâ‚„; Mohs hardness - 7.5; Named after - hafnium, zircon.
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
- tetragonal
- Strunz group
- silicates
- Elements
- Hf, O, Si
- Named after
- other
Also on the record
- Formula
- HfSiOâ‚„
- Mohs hardness
- 7.5
- Named after
- hafnium, zircon