Mineraldle
Puzzle #101 was magnesioferrite.
Magnesioferrite is a magnesium iron oxide mineral, a member of the magnetite series of spinels. Magnesioferrite crystallizes as black metallic octahedral crystals. It is named after its chemical composition of magnesium and ferric iron.
What the record says
Puzzle 101 ran on 24 Oct 2026 and the answer was magnesioferrite, played with 6 guesses against 4 columns. On the record: Crystal system - cubic; Strunz group - oxides-hydroxides; Elements - Fe, Mg, O; Named after - other.
Beyond the grid the record adds Formula - MgFe³⁺₂O₄; Named after - iron(III), magnesium.
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, Mg, O
- Named after
- other
Also on the record
- Formula
- MgFe³⁺₂O₄
- Named after
- iron(III), magnesium