Mineraldle
Puzzle #65 was yugawaralite.
Yugawaralite is a clear or pinkish mineral of the zeolite group. It was first described by Sakurai and Hayashi (1952) near a waterfall by some hot springs near Yugawara.
What the record says
Puzzle 65 ran on 18 Sep 2026 and the answer was yugawaralite, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - silicates; Elements - Al, Ca, H, O, Si; Named after - other.
Beyond the grid the record adds Formula - Ca(Si₆Al₂)O₁₆·4H₂O; Named after - Yugawara Onsen.
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
- other
Also on the record
- Formula
- Ca(Si₆Al₂)O₁₆·4H₂O
- Named after
- Yugawara Onsen