Gypsum – Saline di Volterra, Tuscany (Italy) An attractive specimen of high-quality gypsum from the renowned locality Saline di Volterra, famous worldwide for producing some of the finest gypsum crystals. The crystals are exceptionally clean, lustrous, and well-terminated, with a strongly prismatic habit that resembles tourmaline crystals in appearance. An excellent piece for: collectors of fine European mineral localities aesthetic display collections a representative example of top-quality gypsum Saline di Volterra is rightly considered one of the world’s best localities for this type of gypsum, and this specimen is a beautiful example of its exceptional quality.