Mineraldle
Puzzle #99 was hauerite.
Hauerite is a sulfide mineral in the pyrite group. It is the mineral form of manganese disulfide MnS2. It forms reddish brown or black octahedral crystals with the pyrite structure and it is usually found associated with the sulfides of other transition metals such as rambergite.
Read about it on Wikipedia →
What the record says
Puzzle 99 ran on 22 Oct 2026 and the answer was hauerite, played with 6 guesses against 4 columns. On the record: Crystal system - cubic; Strunz group - sulfides-sulfosalts; Elements - Mn, S; Named after - person.
Beyond the grid the record adds Formula - MnSâ‚‚; Named after - Franz Ritter von Hauer, Joseph von Hauer, duo.
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
- cubic
- Strunz group
- sulfides-sulfosalts
- Elements
- Mn, S
- Named after
- person
Also on the record
- Formula
- MnSâ‚‚
- Named after
- Franz Ritter von Hauer, Joseph von Hauer, duo