Mineraldle
Puzzle #27 was fayalite.
Fayalite is the iron-rich end-member of the olivine solid-solution series. In common with all minerals in the olivine group, fayalite crystallizes in the orthorhombic system with cell parameters a = 4.82 Å, b = 10.48 Å and c = 6.09 Å.
What the record says
Puzzle 27 ran on 11 Aug 2026 and the answer was fayalite, played with 6 guesses against 4 columns. On the record: Crystal system - orthorhombic; Strunz group - silicates; Elements - Fe, O, Si; Named after - place.
Beyond the grid the record adds Formula - Fe²⁺₂SiO₄; Named after - Faial Island.
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
- orthorhombic
- Strunz group
- silicates
- Elements
- Fe, O, Si
- Named after
- place
Also on the record
- Formula
- Fe²⁺₂SiO₄
- Named after
- Faial Island