Ontology, archetypes and the definition of “mineral species”

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Ontology, archetypes and the definition of “mineral species”

Messaggio da Marco E. Ciriotti » mer 03 mar, 2021 10:19

Prossima pubblicazione.

Referenza:
▪ Hawthorne, F.C., Mills, S.J., Hatert, F., Rumsey, M.S. (2021): Ontology, archetypes and the definition of “mineral species”. MIneralogical Magazine, 85, (in press).

Abstract:
Ontology deals with questions concerning what things exist, and how such things may be associated according to similarities and differences and related within a hierarchy. Ontology provides a rigorous way to develop a general definition of a mineral species. Properties may be divided into two principal groups: an intrinsic property is characteristic of the object and is independent of anything else; an extrinsic property depends on the relation between the object and other things. A universal is an entity that is common to all objects in a set. Here the objects are mineral samples, each entity is a specific property of these minerals, and the set of objects is all mineral samples of that mineral species. The key intrinsic properties of a mineral species are its name, its end-member formula and Z (the number of formula units in the unit cell), its space group and the bond topology of the end-member structure. These are also universals as they are common to all mineral samples belonging to that mineral species. An archetype is a pure form which embodies the fundamental characteristics of an object. Thus the archetype of a mineral species embodies the above set of universals. Real mineral samples of this mineral species are imperfect copies of that archetype, with a range of chemical composition defined by the boundaries between end-member formulae of this and other end members of the same bond topology. The result is a formal definition of a mineral species: A specific mineral species is the set of imperfect copies of the corresponding archetype and is defined by the following set of universals: name, end-member formula and Z, space group, and bond topology of the end-member structure, with the range of chemical composition limited by the compositional boundaries between end members with the same bond topology.

NdR: Vedasi al riguardo quanto consuntivato nell'ultimo messaggio in: viewtopic.php?f=5&t=3276&start=30
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Avatar utente
Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Ontology, archetypes and the definition of “mineral species”

Messaggio da Marco E. Ciriotti » dom 18 apr, 2021 10:24

Pubblicazione effettuata.

Referenza:
▪ Hawthorne, F.C., Mills, S.J., Hatert, F., Rumsey, M.S. (2021): Ontology, archetypes and the definition of “mineral species”. MIneralogical Magazine, 85, 125-131.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Avatar utente
Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Ontology, archetypes and the definition of “mineral species”

Messaggio da Marco E. Ciriotti » mar 13 lug, 2021 14:37

Referenza:
▪ Hawthorne, F.C., Mills, S.J., Hapert, F., Rumsey, M.S. (2021): Ontology, archetypes and the definition of ‘mineral species’ - ERRATUM. Mineralogical Magazine, 85, (in press).

Text:
We made the following statement in this paper in Mineralogical Magazine, 85(2), 125–131 under the heading ‘Extrinsic properties of a mineral’ on page 128:
“What are extrinsic properties of a mineral? Refractive index (dependent on the wavelength of light illuminating the crystal), density (dependent on the value of gravitational acceleration at the location of the mineral), unit-cell volume (dependent on ambient temperature and pressure).”
The word “density” should be replaced by the word “weight”; this example is given correctly on page 127.
Acknowledgements: We thank our numerous colleagues who drew our attention to this miserable lapse in concentration.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Rispondi

Chi c’è in linea

Visitano il forum: Nessuno e 50 ospiti