Mineraldle
Puzzle #14 was skutterudite.
Skutterudite is a cobalt arsenide mineral containing variable amounts of nickel and iron substituting for cobalt with the ideal formula CoAs3. Some references give the arsenic a variable formula subscript of 2–3. High nickel varieties are referred to as nickel-skutterudite, previously chloanthite.
Read about it on Wikipedia →
What the record says
Puzzle 14 ran on 29 Jul 2026 and the answer was skutterudite, played with 6 guesses against 4 columns. On the record: Crystal system - cubic; Strunz group - sulfides-sulfosalts; Elements - As, Co; Named after - place.
Beyond the grid the record adds Formula - CoAs₃; Named after - Skutterud mines.
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
- sulfides-sulfosalts
- Elements
- As, Co
- Named after
- place
Also on the record
- Formula
- CoAs₃
- Named after
- Skutterud mines