Macphersonite
Macphersonite, Pb4(SO4)(CO3)2 (OH)2, is a carbonate mineral that is trimorphous with leadhillite and susannite. Macphersonite is generally white, colorless, or a pale amber in color and has a white streak. It crystallizes in the orthorhombic system with a space group of Pcab. It is fairly soft mineral that has a high specific gravity.
Macphersonite is named after Harry Gordon Macpherson,[4] a keeper of minerals at the Royal Scottish Museum. It was discovered and accepted in 1984.