Mineraldle
Puzzle #24 was gismondine-Ca.
Gismondine is a mineral with the chemical formula CaAl2Si2O8·4H2O. It is a zeolite or hydrated aluminosilicate. It forms colorless, bipyramidal crystals of orthorhombic symmetry.
What the record says
Puzzle 24 ran on 8 Aug 2026 and the answer was gismondine-Ca, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - silicates; Elements - Al, Ca, H, O, Si; Named after - person.
Beyond the grid the record adds Formula - Ca₂(Si₄Al₄)O₁₆·8H₂O; Named after - Carlo Giuseppe Gismondi, calcium, gismondine.
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
- monoclinic
- Strunz group
- silicates
- Elements
- Al, Ca, H, O, Si
- Named after
- person
Also on the record
- Formula
- Ca₂(Si₄Al₄)O₁₆·8H₂O
- Named after
- Carlo Giuseppe Gismondi, calcium, gismondine