Hedenbergite - Ilvaite skarn, Calamita, Island of Elba
Condensation drop on sulphur
Calcite crystals of microbial origin
A fragile equilibrium
Emoji from meteorites; impact spherule
Goethite with hematite
Sphalerite's "Transformer"
Blue Olivine in an unusual basalt
The Grid: A serpentine pseudomorph after carbonate
Cooking crystals in the Earth cauldron