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Very different substances present absolutely the same form: fluorite, rock salt, pyrite and galena all crystallise in cubes, and the same minerals with alum and diamond take the regular octahedron.
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Different substances can share exactly the same crystal form
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Haüy RJ, “Traité de minéralogie, tome premier”, Conseil des Mines, Paris (Chez Louis) (1801); Discours préliminaire, p. 11. Scope: Cubic minerals; form shared across chemistry.
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Haüy RJ. Traité de minéralogie, tome premier. Conseil des Mines, Paris (Chez Louis) (1801)
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René Just Haüy
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1801
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Volume 1 holds the general theory of crystal structure: integrant molecules, the primitive form, and the laws of decrement first published in the 1784 Essai. The 1784 Essai (archive.org bub_gb_HbJDAAAAcAAJ) was fetched but its eighteenth-century OCR (long s) is too corrupt to quote; see SEARCHES.md. French.
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Public domain (1801).
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Traité de minéralogie, tome premier
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Reading copy of Traité de minéralogie, tome premier
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Page 11 of the reading copy; paragraph 272 of the normalised text 1801-hauy.txt (sha256 75e8725eafc33d75d3da5d556fa40bdfeaf55bd1fcb6fddfa8cdb23a59082d19), produced by build/fetch.py and checked by build/check-quotes.mjs. The text itself is not committed.
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on rencontre des substances très-dilferentes qui présentent absolument la même forme. Ainsi la chaux fliiatée , la soude muriatée , le fer sulfuré, le plomb sulfuré , etc. cristallisent en cubes dans certaines circonstances
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René Just Haüy 1801 claim: Different substances can share exactly the same crystal form
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