Plattnerite, and its occurrence near Mullan, Idaho

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1892
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Abstract
UNDER the name, Schwel'bleierz, in the year 1837, lead dioxide as a mineral species was described by Breithaupt.*A quantitative determination of the lead by Plattner was given.As to its occurrence, Breithauptt says, that the only piece of the mineral obtained by him was a large botryoidal mass formed of concentric layers, almost entirely covered by cerussite, pyromorphite and leadhillite.Also, that he did not know the place of its occurrence; but, as the last-named mineral was then known to occur only at Leadhills, Scotland, he concluded, that the "Schwerbleierz" Was probably found at that locality.T.he mineral is described as having a metallicadamantine luster, becomhlg dull by tarnish; in color, ironblack, with b"own streak; opaque; C/'ystallized and massive, the crystals, rhombohedral, in hexagonal prisllls with the combinatiou, P, ~P, OP; indistinctly cleavable; fracture, uneven; brittle; specific gravity, 9'392 and 9'448, the result of two determinations.Some years after the mineral was described by Breithaupt, Haidinger:j: gave it the name of plattnerite, and, a little later, Hausmann § called it brann bleioxyd.In 1858, Greg and Lettsomll used the name pJattncrite, in: describing the species in their mineralogy, and added this note :-" The authors can leaI'll nothing more about this species, and.consider it a doubtful one.The specific gravity seems too high to be correct, since it •is double that of minium, and even more than that of galena.The crystals, described as being hex!lgonal prisms, may possibly have been pseudomorphous of pyromorphite."In Dana's Mineralogy" under.plattnerite, the following comment is made :-" A doubtful species.The specific gravity given is as high as that of the protoxyd of lead."In a paper read before the MineralogicaL Society of London, June 22nd, 188H, Prof. Edward Kiuch**-described a well authenticated specimen of plattnerite from Leadhills, Scotland, giving *
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Authors W. S. Yeates, E. F. Ayres
Journal american journal of science
Year 1892
DOI
10.2475/ajs.s3-43.257.407
URL
https://ajsonline.org/article/62992.pdf
Keywords Keywords not found

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