In this communication we present a brief response to Hawthorne (2023) who, in a paper in volume 87, doi.org/10.1180/mgm.2023.8 (this journal), claims evidence for violations of the electroneutrality principle in mineral formulae derived through IMA-CNMNC procedures: i.e. the dominant-constituent rule, the valency-imposed double site-occupancy, the dominant-valency rule, and the site-total-charge approach (STC). His statement is not correct as the STC method is based on the end-member definition; thus, it cannot violate the requirements of an end-member, particularly the laws of conservation of electric charge. The STC was developed to address the shortcomings in the previous IMA-CNMNC procedures. The real question is: which method to use to define an end-member formula? Currently, there are two approaches: (1) STC, which first identifies the dominant end-member charge arrangement and then leads to the dominant end-member composition; (2) the dominant end-member approach.
A brief comment on Hawthorne (2023).: "On the definition of distinct mineral species. A critique of current IMA-CNMNC procedures" / Bosi, F.; Hatert, F.; Pasero, M.; Mills, S. J.; Miyawaki, R.; Halenius, U.. - In: MINERALOGICAL MAGAZINE. - ISSN 0026-461X. - 87:3(2023), pp. 505-507. [10.1180/mgm.2023.33]
A brief comment on Hawthorne (2023).: "On the definition of distinct mineral species. A critique of current IMA-CNMNC procedures"
Bosi F.
;
2023
Abstract
In this communication we present a brief response to Hawthorne (2023) who, in a paper in volume 87, doi.org/10.1180/mgm.2023.8 (this journal), claims evidence for violations of the electroneutrality principle in mineral formulae derived through IMA-CNMNC procedures: i.e. the dominant-constituent rule, the valency-imposed double site-occupancy, the dominant-valency rule, and the site-total-charge approach (STC). His statement is not correct as the STC method is based on the end-member definition; thus, it cannot violate the requirements of an end-member, particularly the laws of conservation of electric charge. The STC was developed to address the shortcomings in the previous IMA-CNMNC procedures. The real question is: which method to use to define an end-member formula? Currently, there are two approaches: (1) STC, which first identifies the dominant end-member charge arrangement and then leads to the dominant end-member composition; (2) the dominant end-member approach.File | Dimensione | Formato | |
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