Mineraldle
Puzzle #89 was hematite.
Hematite, also spelled as haematite, is a common iron oxide compound with the formula Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe2O3. It has the same crystal structure as corundum (Al2O3) and ilmenite (FeTiO3).
Read about it on Wikipedia →
What the record says
Puzzle 89 ran on 12 Oct 2026 and the answer was hematite, played with 6 guesses against 4 columns. On the record: Crystal system - trigonal; Strunz group - oxides-hydroxides; Elements - Fe, O; Named after - other.
Beyond the grid the record adds Formula - Fe₂O₃; Mohs hardness - 6; Named after - blood, stone.
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
- trigonal
- Strunz group
- oxides-hydroxides
- Elements
- Fe, O
- Named after
- other
Also on the record
- Formula
- Fe₂O₃
- Mohs hardness
- 6
- Named after
- blood, stone