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Plaqionite, Heteromorphite and Semseyite as Members of a Natural Group of Minerals

1899; Volume: 12; Issue: 55 Linguagem: Inglês

10.1180/minmag.1899.012.55.02

2515-821X

L. J. Spencer, G. T. Prior,

History and Theory of Mathematics

In a recent number of this Magazine (1897, XI. p. 192) a paper by me on "The Crystallography of Plagionite" gives the results of goniometric measurements and specific gravity determinations made on crystals of plagionite from Wolfsberg in the Harz; it was also suggested on crystallographic grounds that the mineral from Arnsberg in Westphalia described by Pisani as heteromorphite was identical with plagionite: but as no quantitative chemical analyses were made on the material measured, these results were not altogether satisfactory.