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