Mineraldle
Puzzle #37 was thaumasite.
Thaumasite is a calcium silicate mineral, containing Si atoms in unusual octahedral configuration, with chemical formula Ca3Si(OH)6(CO3)(SO4)·12H2O, also sometimes more simply written as CaSiO3·CaCO3·CaSO4·15H2O.
Read about it on Wikipedia →
What the record says
Puzzle 37 ran on 21 Aug 2026 and the answer was thaumasite, played with 6 guesses against 4 columns. On the record: Crystal system - hexagonal; Strunz group - sulfates-related; Elements - C, Ca, H, O, S, Si; Named after - other.
Beyond the grid the record adds Formula - Ca₃Si(OH)₆(SO₄)(CO₃)·12H₂O; Named after - surprise.
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
- hexagonal
- Strunz group
- sulfates-related
- Elements
- C, Ca, H, O, S, Si
- Named after
- other
Also on the record
- Formula
- Ca₃Si(OH)₆(SO₄)(CO₃)·12H₂O
- Named after
- surprise