Calcite

Splits into neat little boxes when it feels like it.

Tier: Common
Base odds: 1 in 18
Sell value: 10 coins
Zone: Meadow

With a mutation

Ancient: 500 coins
Glitched: 150 coins
Radiant: 50 coins
Shiny: 20 coins

Your luck, pets and passes make rare gems more likely than the base odds shown.