Mineraldle
Puzzle #3 was francevillite.
Francevillite is a uranyl-group vanadate mineral in the tyuyamunite series. Its chemical formula is (Ba,Pb)(UO2)2V2O8·5(H2O). Francevillite is a strongly radioactive mineral.
Read about it on Wikipedia →
What the record says
Puzzle 3 ran on 18 Jul 2026 and the answer was francevillite, played with 6 guesses against 4 columns. On the record: Crystal system - orthorhombic; Strunz group - oxides-hydroxides; Elements - Ba, H, O, U, V; Named after - place.
Beyond the grid the record adds Formula - Ba(UO₂)₂(VO₄)₂·5H₂O; Named after - Franceville.
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
- orthorhombic
- Strunz group
- oxides-hydroxides
- Elements
- Ba, H, O, U, V
- Named after
- place
Also on the record
- Formula
- Ba(UO₂)₂(VO₄)₂·5H₂O
- Named after
- Franceville