Mineraldle
Puzzle #59 was inyoite.
Inyoite, named after Inyo County, California, where it was discovered in 1914, is a colourless monoclinic mineral. It turns white on dehydration. Its chemical formula is Ca(H4B3O7)(OH)·4H2O or CaB3O3(OH)5·4H2O. Associated minerals include priceite, meyerhofferite, colemanite, hydroboracite, ulexite and gypsum.
Read about it on Wikipedia →
What the record says
Puzzle 59 ran on 12 Sep 2026 and the answer was inyoite, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - borates; Elements - B, Ca, H, O; Named after - place.
Beyond the grid the record adds Formula - CaB₃O₃(OH)₅·4H₂O; Named after - Inyo County.
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
- borates
- Elements
- B, Ca, H, O
- Named after
- place
Also on the record
- Formula
- CaB₃O₃(OH)₅·4H₂O
- Named after
- Inyo County