Mineraldle
Puzzle #7 was pectolite.
Pectolite is a white to gray mineral, NaCa2Si3O8(OH), a sodium calcium hydroxide inosilicate. It crystallizes in the triclinic system typically occurring in radiated or fibrous crystalline masses. It has a Mohs hardness of 4.5 to 5 and a specific gravity of 2.7 to 2.9.
Read about it on Wikipedia →
What the record says
Puzzle 7 ran on 22 Jul 2026 and the answer was pectolite, played with 6 guesses against 4 columns. On the record: Crystal system - triclinic; Strunz group - silicates; Elements - Ca, H, Na, O, Si; Named after - other.
Beyond the grid the record adds Formula - NaCa₂Si₃O₈(OH); Named after - denaturation.
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
- triclinic
- Strunz group
- silicates
- Elements
- Ca, H, Na, O, Si
- Named after
- other
Also on the record
- Formula
- NaCa₂Si₃O₈(OH)
- Named after
- denaturation