Tags: Chemical Substance, Mineral.
Phosgenite is a rare mineral consisting of lead chlorocarbonate (PbCl)2CO3. The tetragonal crystals are prismatic or tabular in habit: they are usually colorless and transparent and have a brilliant adamantine lustre. Sometimes the crystals have a curious helical twist about the tetrad or principal axis. The hardness is 3 and the specific gravity 6.3. The mineral is rather sectile and consequently was earlier known as corneous lead.
