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Arrheniusite-(Ce), CaMg[(Ce (sub 7) Y (sub 3) )Ca (sub 5) ](SiO (sub 4) ) (sub 3) (Si (sub 3) B (sub 3) O (sub 18) )(AsO (sub 4) ) (BO (sub 3) )F (sub 11) , a new member of the vicanite group, from the Ostanmossa Mine, Norberg, Sweden

Dan Holtstam, Luca Bindi, Paola Bonazzi, Hans-Juergen Foerster and Ulf B. Andersson
Arrheniusite-(Ce), CaMg[(Ce (sub 7) Y (sub 3) )Ca (sub 5) ](SiO (sub 4) ) (sub 3) (Si (sub 3) B (sub 3) O (sub 18) )(AsO (sub 4) ) (BO (sub 3) )F (sub 11) , a new member of the vicanite group, from the Ostanmossa Mine, Norberg, Sweden
The Canadian Mineralogist (March 2021) 59 (1): 177-189

Abstract

Arrheniusite-(Ce) is a new mineral (IMA 2019-086) from the Oestanmossa mine, one of the Bastnaes-type deposits in the Bergslagen ore region, Sweden. It occurs in a metasomatic F-rich skarn, associated with dolomite, tremolite, talc, magnetite, calcite, pyrite, dollaseite-(Ce), parisite-(Ce), bastnaesite-(Ce), fluorbritholite-(Ce), and gadolinite-(Nd). Arrheniusite-(Ce) forms anhedral, greenish-yellow translucent grains, exceptionally up to 0.8 mm in diameter. It is optically uniaxial (-), with omega = 1.750(5), epsilon = 1.725(5), and non-pleochroic in thin section. The calculated density is 4.78(1) g/cm (super 3) . Arrheniusite-(Ce) is trigonal, space group R3m, with unit-cell parameters a = 10.8082(3) A, c = 27.5196(9) A, and V = 2784.07(14) A (super 3) for Z = 3. The crystal structure was refined from X-ray diffraction data to R1 = 3.85% for 2286 observed reflections [F (sub o) > 4sigma (F (sub o) )]. The empirical formula for the fragment used for the structural study, based on EPMA data and results from the structure refinement, is: (Ca (sub 0.65) As (super 3+) (sub 0.35) ) (sub Sigma 1) (Mg (sub 0.57) Fe (super 2+) (sub 0.30) As (super 5+) (sub 0.10) Al (sub 0.03) ) (sub S1) [(Ce (sub 2.24 ) Nd (sub 2.13) La (sub 0.86) Gd (sub 0.74) Sm (sub 0.71) Pr (sub 0.37) ) (sub Sigma 7.05) (Y (sub 2.76) Dy (sub 0.26) Er (sub 0.1 1) Tb (sub 0.08 ) Tm (sub 0.01) Ho (sub 0.04) Yb (sub 0.01) ) (sub Sigma 3.27) Ca (sub 4.14) ] (sub Sigma 14.46) (SiO (sub 4) ) (sub 3) [(Si (sub 3.2 6) B (sub 2.74) ) (sub Sigma 6) O (sub 17.31) F (sub 0.69) ][(As (super 5+) (sub 0.65) Si (sub 0.22) P (sub 0.13) ) (sub Sigma 1) O (sub 4) ](B (sub 0.77) O (sub 3) )F (sub 11) ; the ideal formula obtained is CaMg[(Ce (sub 7) Y (sub 3) )Ca (sub 5) ](SiO (sub 4) ) (sub 3) (Si (sub 3) B (sub 3) O (sub 18) )(AsO (sub 4) )(BO (sub 3) )F (sub 11) . Arrheniusite-(Ce) belongs to the vicanite group of minerals and is distinct from other isostructural members mainly by having a Mg-dominant, octahedrally coordinated site (M6); it can be considered a Mg-As analog to hundholmenite-(Y). The threefold coordinated T5 site is partly occupied by B, like in laptevite-(Ce) and vicanite-(Ce). The mineral name honors C.A. Arrhenius (1757-1824), a Swedish officer and chemist, who first discovered gadolinite-(Y) from the famous Ytterby pegmatite quarry.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 59
Serial Issue: 1
Title: Arrheniusite-(Ce), CaMg[(Ce (sub 7) Y (sub 3) )Ca (sub 5) ](SiO (sub 4) ) (sub 3) (Si (sub 3) B (sub 3) O (sub 18) )(AsO (sub 4) ) (BO (sub 3) )F (sub 11) , a new member of the vicanite group, from the Ostanmossa Mine, Norberg, Sweden
Affiliation: Swedish Museum of Natural History, Department of Geosciences, Stockholm, Sweden
Pages: 177-189
Published: 20210304
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 40
Accession Number: 2021-043774
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 tables
N65°04'60" - N65°04'60", E15°55'60" - E15°55'60"
Secondary Affiliation: Universita degli Studi di Firenze, ITA, ItalyGFZ German Research Centre for Geosciences, DEU, GermanyLuossavaara-Kiirunavaara, SWE, Sweden
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202130
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