Sea shells are made of calcite, as is marble. Alabaster is a very fine, translucent form of calcite. A soft malleable stone, large pieces of calcite sometimes have a powdery feel.
Calcite is very delicate and susceptible to both acid and abrasion. It also absorbs oils easily.
Calcite has been used to make jewelry and beads since ancient Egyptian times.
Alabama: marble, official state rock