Aesthetic specimen from Pisa Province of Gypsum in a myriad of crystals most of which with a natural dovetail termination in a beautiful grey-black color in graduated shades. This is the famous "tube Gypsum". It's a Gyspum that forms completely naturally on the internal walls of disused pipes in which the decantation and waste water from the processing and production of soda flowed Origin: Larderello, Pomarance, Pisa Province, Tuscany, Italy Size: 13.6 X 9.8 X 5.4 cm. Weight: 253 Gr. Please keep in mind that photos are taken inside a box with LED lights and that the colors may be slightly different. Detail photos are obviously enlarged to show the particularities at their best. If youd nee you can contact us to have videos of the piece taken in daylight