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Game-changing Gemmologists: 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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