Article (Scientific journals)
Ontology, archetypes and the definition of 'mineral species'
Hawthorne, Frank; Mills, Stuart; Hatert, Frédéric et al.
2021In Mineralogical Magazine, 85 (2), p. 125-131
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Keywords :
mineral species; definition; intrinsic properties; extrinsic properties; universals; archetype; Geochemistry and Petrology
Abstract :
[en] 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 endmember 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.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Hawthorne, Frank ;   Department of Geological Sciences, University of Manitoba, Winnipeg, Canada
Mills, Stuart;   Geosciences, Melbourne, Australia
Hatert, Frédéric  ;  Université de Liège - ULiège > Geology
Rumsey, Mike;   Department of Earth Sciences, Natural History Museum, London, England, UK
Language :
English
Title :
Ontology, archetypes and the definition of 'mineral species'
Publication date :
03 March 2021
Journal title :
Mineralogical Magazine
ISSN :
0026-461X
eISSN :
1471-8022
Publisher :
Mineralogical Society
Volume :
85
Issue :
2
Pages :
125-131
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 March 2022

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