Gem Rocks

Calcite
Calcite is made of calcium carbonate (CaCO3). Generally white to clear, calcite is easily scratched with a knife. Due to the presence of carbonates (CO3), calcite reacts to most acids (such as hydrochloric acid, HCl) and effervesces on contact. Most seashells are made of calcite or related minerals. Calcite can be found in many cave and karst formations such as the calcite features at:

Jewel Cave National Monument, South Dakota

Agouim region, Morocco. Agate with a calcite twin, 12x9cm🤩

😍Every purchase in one purchase with one insulated center, Agouim Gebiet, Morocco, 16x13cm.