Phosgenite
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Phosgenite

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Phosgenite is a rare mineral consisting of lead chlorocarbonate, (PbCl)2CO3. The tetragonal, holosymmetric, crystals are prismatic or tabular in habit, and are bounded by smooth, bright faces: 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 ...