Old samples - new amphiboles

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Cámara, Fernando,1967-Università degli Studi di Milano, (author)

Old samples - new amphiboles

Article/chapterEnglish2022

Publisher, publication year, extent ...

Lyon,2022
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:nrm-4856
https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-4856URI

Supplementary language notes

Language:English
Summary in:English

Part of subdatabase

SwePubSwePub

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Subject category:vet swepub-contenttype
Subject category:kon swepub-publicationtype

Notes

The scientific value of old and well-preserved collections is priceless. Samples that already have been studied and described can still give very useful information. For instance, minerals with complex solid solutions like amphiboles sometimes show new compositions that are feasible because of crystal-chemistry and charge arrangements, based on the current classification scheme by Hawthorne et al. (2012) for the amphibole supergroup. In the last four years, a fruitful collaboration between the Swedish Museum of Natural History and the Department of Earth Sciences of the University of Milan has allowed the identification of new amphibole species, recognized by CNMNC-IMA. First of all, we identified hjalmarite, [ANaB(NaMn)CMg5TSi8O22W(OH)2], which is related to richterite via the homovalent substitution [B]Ca2+ → [B]Mn2+, and is the second recognized member of the sodium–(magnesium–iron–manganese) subgroup, after ferri-ghoseite. Sjögren (1891) had described a physically similar, MnO-rich sample from Långban, named “astochit”. A related amphibole, although belonging to a different subgroup, that we have formally described is potassic-richterite, [AKB(NaCa)CMg5TSi8O22W(OH)2]. It was found in a sample from the Pajsberg iron and manganese ore mines, which was originally collected by the mineralogist Lars Johan Igelström, probably in the 1850s. The most recent amphibole we have described is ferri-taramite [ANaB(NaCa)C(Mg3Fe3+2)T(Si6Al2)O22W(OH)2], found in a skarn sample from the Jakobsberg manganese mine: it was once examined by Flink (1914), who noted the unusual character of the amphibole and described it as a “strange hornblende”.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Geologi hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Geology hsv//eng
amfibol
nytt mineral
mineralnomenklatur
Långban-typ
skarn
The changing Earth
Den föränderliga jorden

Added entries (persons, corporate bodies, meetings, titles ...)

Holtstam, Dan,1963-Naturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)DANHOLTS (author)
Karlsson, AndreasNaturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)ANDRKARL (author)
Skogby, Henrik,1956-Naturhistoriska riksmuseet,Enheten för geovetenskap(Swepub:nrm)HENRSKOG (author)
Università degli Studi di Milano,Enheten för geovetenskap (creator_code:org_t)

Related titles

In:Abstracts, International Mineralogical Association 23<sup>rd</sup> General meetingLyon, s. 42-42

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geology

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By the university: Swedish Museum of Natural History

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