Mineraldle
Puzzle #5 was diamond.
Diamond is a mineral form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Diamond is a tasteless, odorless, strong, brittle solid, a poor conductor of electricity, colorless in pure form, and insoluble in water. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, but diamond is metastable and converts to it at a negligible rate under those conditions.
Read about it on Wikipedia →
What the record says
Puzzle 5 ran on 20 Jul 2026 and the answer was diamond, played with 6 guesses against 4 columns. On the record: Crystal system - cubic; Strunz group - native-elements; Elements - C; Named after - other.
Beyond the grid the record adds Formula - C; Mohs hardness - 10; Named after - Invincible.
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
- native-elements
- Elements
- C
- Named after
- other
Also on the record
- Formula
- C
- Mohs hardness
- 10
- Named after
- Invincible