Calcite (CaCO3) is the most common mineral in Slovenia. It is the building block of various rocks such as limestone, marble, tufa, etc.
It also forms unique stalactite formations inside caves. It can be admired in more or less perfect crystal form inside cavities and cracks within limestone or in septarian concretions. Specimens that glow under ultraviolet light are particularly attractive.
Colourless, pure calcite crystals display birefringence, which is a property that never fails to arouse interest among young visitors.
Many marine organisms build skeletons or even entire homes out of calcite. Corals, snails and clams come to mind, but there are many more. Due to its morphological diversity and the many forms it appears in, calcite is one of the most beloved minerals.