Mineraldle
Puzzle #78 was dawsonite.
Dawsonite is a mineral composed of sodium aluminium carbonate hydroxide, chemical formula NaAlCO3(OH)2. It crystallizes in the orthorhombic crystal system. It is not mined for ore.
Read about it on Wikipedia →
What the record says
Puzzle 78 ran on 1 Oct 2026 and the answer was dawsonite, played with 6 guesses against 4 columns. On the record: Crystal system - orthorhombic; Strunz group - carbonates-nitrates; Elements - Al, C, H, Na, O; Named after - person.
Beyond the grid the record adds Formula - NaAl(CO₃)(OH)₂; Mohs hardness - 3; Named after - John William Dawson.
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
- carbonates-nitrates
- Elements
- Al, C, H, Na, O
- Named after
- person
Also on the record
- Formula
- NaAl(CO₃)(OH)₂
- Mohs hardness
- 3
- Named after
- John William Dawson