Mineraldle
Puzzle #43 was bunsenite.
Bunsenite is the naturally occurring form of nickel(II) oxide, NiO. It occurs as rare dark green crystal coatings. It crystallizes in the cubic crystal system and occurs as well formed cubic, octahedral and dodecahedral crystals.
Read about it on Wikipedia →
What the record says
Puzzle 43 ran on 27 Aug 2026 and the answer was bunsenite, played with 6 guesses against 4 columns. On the record: Crystal system - cubic; Strunz group - oxides-hydroxides; Elements - Ni, O; Named after - person.
Beyond the grid the record adds Formula - NiO; Named after - Robert Bunsen.
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
- cubic
- Strunz group
- oxides-hydroxides
- Elements
- Ni, O
- Named after
- person
Also on the record
- Formula
- NiO
- Named after
- Robert Bunsen