Metamorphic rock, formed as a result of frequent telluric shifts:
- Sedimentary: marble, limestone, dolomite, chalk, sandstone, bauxite
- Magmatic: basalt, granite, diorite.
The rocks in this area date back 230 million years. At that time, the present-day area looked like today’s tropical islands; in fact, these rocks were deposited in the carbonate platform marine environment (corals, shells, mollusc shells, crustaceans, all visible when observing the rocks under a microscope), forming the mineral by diagenesis. These rocks (limestones) are very porous and within them we find voids or air pockets that, over millennia, fill with various minerals; these voids were formed by the passage of water with a high calcium, magnesium and iron content, forming the mineral by the effect of sublimation.