What is "macphersonite"

n. (context mineralogy English) An orthorhombic-dipyramidal mineral containing carbon, hydrogen, lead, oxygen, and sulfur.

Macphersonite, Pb(SO)(CO) (OH), 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, a keeper of minerals at the Royal Scottish Museum. It was discovered and accepted in 1984.