Found all over the world, calcite is the most stable form of calcium carbonate and is the main mineral found in limestone.

Electron microscope images of knobby starfish’s calcite skeletons reveal an unexpected architecture that compensates for the mineral’s brittleness.

HANNA, Utah — Did you know Utah has a new state stone? On March 16 th, Governor Spencer Cox signed off on House Bill 188 which recognizes honeycomb calcite. The semi-precious stone was first ...