Mineraldle
Puzzle #6 was brucite.
Brucite is the mineral form of magnesium hydroxide, with the chemical formula Mg(OH)2. It is a common alteration product of periclase in marble; a low-temperature hydrothermal vein mineral in metamorphosed limestones and chlorite schists; and formed during serpentinization of dunites. Brucite is often found in association with serpentine, calcite, aragonite, dolomite, magnesite, hydromagnesite, artinite, talc and chrysotile.
Read about it on Wikipedia →
What the record says
Puzzle 6 ran on 21 Jul 2026 and the answer was brucite, played with 6 guesses against 4 columns. On the record: Crystal system - trigonal; Strunz group - oxides-hydroxides; Elements - H, Mg, O; Named after - person.
Beyond the grid the record adds Formula - Mg(OH)â‚‚; Named after - Archibald Bruce.
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
- trigonal
- Strunz group
- oxides-hydroxides
- Elements
- H, Mg, O
- Named after
- person
Also on the record
- Formula
- Mg(OH)â‚‚
- Named after
- Archibald Bruce