Mineraldle
Puzzle #117 was magnetite.
Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe2+Fe3+2O4. It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. With the exception of extremely rare native iron deposits, it is the most magnetic of all the naturally occurring minerals on Earth.
What the record says
Puzzle 117 ran on 9 Nov 2026 and the answer was magnetite, played with 6 guesses against 4 columns. On the record: Crystal system - cubic; Strunz group - oxides-hydroxides; Elements - Fe, O; Named after - other.
Beyond the grid the record adds Formula - Fe²⁺Fe³⁺₂O₄; Mohs hardness - 6; Named after - Magnesia Prefecture.
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
- oxides-hydroxides
- Elements
- Fe, O
- Named after
- other
Also on the record
- Formula
- Fe²⁺Fe³⁺₂O₄
- Mohs hardness
- 6
- Named after
- Magnesia Prefecture