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Gemmologists who changed the game: René-Just Haüy
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"All minerals which belong to the same species have an invariable form, in which the faces lie in the direction of the natural fracture surfaces corresponding to the mechanical division of the crystals." | Source: IUCr
René-Just Haüy
Engraving from Prodomus Cristallographiae, de Crystallis Improprie sic Dictis Commentarium, M. A. Cappeler, 1723
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