Mineraldle
Puzzle #104 was willemite.
Willemite is a zinc silicate mineral and a minor ore of zinc. It is highly fluorescent (green) under shortwave ultraviolet light. It occurs in a variety of colors in daylight, in fibrous masses and apple-green gemmy masses.
Read about it on Wikipedia →
What the record says
Puzzle 104 ran on 27 Oct 2026 and the answer was willemite, played with 6 guesses against 4 columns. On the record: Crystal system - trigonal; Strunz group - silicates; Elements - O, Si, Zn; Named after - person.
Beyond the grid the record adds Formula - Znâ‚‚SiOâ‚„; Mohs hardness - 5.5; Named after - William I of the Netherlands.
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
- silicates
- Elements
- O, Si, Zn
- Named after
- person
Also on the record
- Formula
- Znâ‚‚SiOâ‚„
- Mohs hardness
- 5.5
- Named after
- William I of the Netherlands