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PHOSGENITE

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Originally appearing in Volume V21, Page 474 of the 1911 Encyclopedia Britannica.
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PHOSGENITE , a rare. See also:

mineral consisting of See also:lead chlorocarbonate, (PbCI)2CO3. The tetragonal (See also:holosymmetric) crystals are prismatic or See also:tabular in See also:habit, and are bounded by smooth, See also:bright faces: they are usually colourless and transparent, and have a brilliant adamantine lustre. Sometimes the crystals have a curious helical twist about the tetrad or See also:principal See also:axis. The hardness is 3 and the specific gravity 6.3. The mineral is rather sectile, and consequently-was See also:early known as " corneous lead " (Ger. Hornblei). The fanciful name phosgenite was given by A. Breithaupt in 1820, from phosgene, the old name of See also:carbon oxychloride, because the mineral contains the elements carbon, See also:oxygen and See also:chlorine. At Cromford, near See also:Matlock, it was See also:long ago found in an old lead mine, being associated with afiglesite and matlockite (Pb2OC12) in cavities in decomposed See also:galena: hence its See also:common name cronfortite. See also:Fine crystals are also found in galena at Monteponi near See also:Iglesias in See also:Sardinia, but the largest are those recently found near Dundas in See also:Tasmania. Crystals of phosgenite, and also of the corresponding See also:bromine See also:compound [PbBr]2CO3, have been prepared artificially. (L.

J.

End of Article: PHOSGENITE

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