Mineraldle
Puzzle #61 was calcite.
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison.
Read about it on Wikipedia →
What the record says
Puzzle 61 ran on 14 Sep 2026 and the answer was calcite, played with 6 guesses against 4 columns. On the record: Crystal system - trigonal; Strunz group - carbonates-nitrates; Elements - C, Ca, O; Named after - other.
Beyond the grid the record adds Formula - CaCO₃; Mohs hardness - 3.04; Named after - lime.
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
- carbonates-nitrates
- Elements
- C, Ca, O
- Named after
- other
Also on the record
- Formula
- CaCO₃
- Mohs hardness
- 3.04
- Named after
- lime