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- W2001156470 abstract "It is observed by the Abbé Haüy in his “Tableau Comparatif &c.” that the crystalline forms of this substance, of which only thirteen varieties had been noticed when his “Traité &c.” was published, amount to the number of sixty-three, in consequence of the researches of M. Mabru among the crystals abounding in the departments of the Puy de Dome and Cantal. In my collection there are about 120 varieties of form, of which the greater part are from the north of England. The primitive crystal, which is a right quadrangular prism with rhomboidal terminations, is subject to several modifications; the varieties delineated by the Abbé Haüy result from various combinations of the planes of eight modifications, with those of the primitive prism; whilst those in my possession result from eighteen. It is impossible even to imagine how many varieties of form may arise from so considerable a number of secondary or modifying planes, when it is considered that the enlargement of the planes of any one modification, may and does often produce in a crystal, so great a difference in general form, from another presenting the same planes, but of different relative size, that the two crystals appear at first sight to have no analogy. * Hence the varieties may be expected to be almost endless. It is not the object of this paper to describe all the crystalline forms in which I have observed this substance. Its intention is much more limited; being only that of noticing, and delineating the" @default.
- W2001156470 created "2016-06-24" @default.
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- W2001156470 date "1821-01-01" @default.
- W2001156470 modified "2023-09-26" @default.
- W2001156470 title "XIII. On the Modifications of the: primitive Crystal of the Sulphate of Barytes." @default.
- W2001156470 doi "https://doi.org/10.1144/transgsla.5.305" @default.
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