Alforsite is a barium phosphate chloride mineral with formula: Ba5(PO4)3Cl. It was discovered in 1981, and named to honor geologist (1930–2005) of the California Geological Survey for his work in the area where it was discovered.
Alforsite is a hexagonal colorless crystal and the group apatite, primarily Fresno , Mariposa Counties. It has also been found in Baja California , Mexico.
Alforsite is a constituent of the apatite group of minerals. It crystallizes in the hexagonal crystal system with a point group of 6/m and space group P63/m. It occurs as colorless grains that are hard to distinguish from fluoroapatite , as they both display low birefringence and high relief.