Mineraldle
Puzzle #15 was aenigmatite.
Aenigmatite, also known as cossyrite after Cossyra, the ancient name of Pantelleria, is a sodium, iron, titanium inosilicate mineral. The chemical formula is Na2Fe2+5TiSi6O20 and its structure consists of single tetrahedral chains with a repeat unit of four and complex side branches. It forms brown to black triclinic lamellar crystals.
What the record says
Puzzle 15 ran on 30 Jul 2026 and the answer was aenigmatite, played with 6 guesses against 4 columns. On the record: Crystal system - triclinic; Strunz group - silicates; Elements - Fe, Na, O, Si, Ti; Named after - other.
Beyond the grid the record adds Formula - Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]; Named after - riddle.
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
- triclinic
- Strunz group
- silicates
- Elements
- Fe, Na, O, Si, Ti
- Named after
- other
Also on the record
- Formula
- Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]
- Named after
- riddle