Mineraldle
Puzzle #84 was glauberite.
Glauberite is a monoclinic sodium calcium sulfate mineral with the formula Na2Ca(SO4)2.
Read about it on Wikipedia →
What the record says
Puzzle 84 ran on 7 Oct 2026 and the answer was glauberite, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - sulfates-related; Elements - Ca, Na, O, S; Named after - person.
Beyond the grid the record adds Formula - Naâ‚‚Ca(SOâ‚„)â‚‚; Named after - Johann Rudolf Glauber.
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
- sulfates-related
- Elements
- Ca, Na, O, S
- Named after
- person
Also on the record
- Formula
- Naâ‚‚Ca(SOâ‚„)â‚‚
- Named after
- Johann Rudolf Glauber