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Recommended nomenclature for the sapphirine and surinamite groups (sapphirine supergroup)

Published online by Cambridge University Press:  05 July 2018

E. S. Grew ,
U. Hålenius ,
M. Pasero  and
J. Barbier
E. S. Grew
Affiliation:
Department of Earth Sciences, University of Maine, 5790 Bryand Research Center, Orono, 04469-5790 Maine, USA
U. Hålenius
Affiliation:
Department of Mineralogy, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden
M. Pasero
Affiliation:
Dipartimentodi Scienze della Terra, Università di Pisa, Via S. Maria 53, I-56126 Pisa, Italy
J. Barbier
Affiliation:
Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1
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Abstract

Minerals isostructural with sapphirine-1A, sapphirine-2M, and surinamite are closely related chain silicates that pose nomenclature problems because of the large number of sites and potential constituents, including several (Be, B, As, Sb) that are rare or absent in other chain silicates. Our recommended nomenclature for the sapphirine group (formerly aenigmatite group) makes extensive use of precedent, but applies the rules to all known natural compositions, with flexibility to allow for yet undiscovered compositions such as those reported in synthetic materials. These minerals are part of a polysomatic series composed of pyroxene or pyroxene-like and spinel modules, and thus we recommend that the sapphirine supergroup should encompass the polysomatic series. The first level in the classification is based on polysome, i.e. each group within the supergroup corresponds to a single polysome. At the second level, the sapphirine group is divided into subgroups according to the occupancy of the two largest M sites, namely, sapphirine (Mg), aenigmatite (Na), and rhönite (Ca). Classification at the third level is based on the occupancy of the smallest M site with most shared edges, M7, at which the dominant cation is most often Ti (aenigmatite, rhönite, makarochkinite), Fe3+ (wilkinsonite, dorrite, høgtuvaite) or Al (sapphirine, khmaralite); much less common is Cr (krinovite) and Sb (welshite). At the fourth level, the two most polymerized T sites are considered together, e.g. ordering of Be at these sites distinguishes høgtuvaite, makarochkinite and khmaralite. Classification at the fifth level is based on XMg = Mg/(Mg + Fe 2+) at the M sites (excluding the two largest and Ml). In principle, this criterion could be expanded to include other divalent cations at these sites, e.g. Mn. To date, most minerals have been found to be either Mg-dominant (XMg > 0.5), or Fe2+-dominant (XMg < 0.5), at these M sites. However, XMg ranges from 1.00 to 0.03 in material described as rhönite, i.e. there are two species present, one Mg-dominant, the other Fe2+-dominant. Three other potentially new species are a Mg-dominant analogue of wilkinsonite, rhönite in the Allende meteorite, which is distinguished from rhonite and dorrite in that Mg rather than Ti or Fe3+ is dominant at Ml, and an Al-dominant analogue of sapphirine, in which Al > Si at the two most polymerized T sites vs. Al < Si in sapphirine. Further splitting of the supergroup based on occupancies other than those specified above is not recommended.

Keywords

nomenclatureaenigmatitesapphirinesurinamitechain silicates
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 4 , August 2008 , pp. 839 - 876
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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