What is "sacrofanite"

n. (context mineralogy English) A hexagonal-dihexagonal dipyramidal colorless mineral containing aluminum, calcium, carbon, chlorine, hydrogen, oxygen, potassium, silicon, sodium, and sulfur.

Sacrofanite is a rare silicate mineral that has the general formula of (Na,Ca)(Si,Al)O(SO,CO,OH,Cl)·n(HO). Nickel, E., and Nichols, M. (1980) IMA/CNMNC List of Mineral Names. Official IMA-CNMNC List of Mineral Names, 247. It was approved as a mineral by the International Mineralogical Association in 1980. Its name comes from the Sacrofano Caldera in the Monti Sabatini from which it was discovered in Latium, Italy.