Mineraldle
Puzzle #28 was annabergite.
Annabergite is an arsenate mineral consisting of a hydrous nickel arsenate. It is considered a member of the vivianite group and known for its ability to form crystals in a characteristic apple-green color.
Read about it on Wikipedia →
What the record says
Puzzle 28 ran on 12 Aug 2026 and the answer was annabergite, played with 6 guesses against 4 columns. On the record: Crystal system - monoclinic; Strunz group - phosphates-related; Elements - As, H, Ni, O; Named after - place.
Beyond the grid the record adds Formula - Ni₃(AsO₄)₂·8H₂O; Named after - Annaberg-Buchholz.
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
- phosphates-related
- Elements
- As, H, Ni, O
- Named after
- place
Also on the record
- Formula
- Ni₃(AsO₄)₂·8H₂O
- Named after
- Annaberg-Buchholz