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Fluorarrojadite-(BaNa), BaNa (sub 4) CaFe (sub 13) Al(PO (sub 4) ) (sub 11) (PO (sub 3) OH)F (sub 2) , a new member of the arrojadite group from Gemerska Poloma, Slovakia

Martin Stevko, Jiri Sejkora, Pavel Uher, Fernando Camara, Radek Skoda and Tomas Vaculovic
Fluorarrojadite-(BaNa), BaNa (sub 4) CaFe (sub 13) Al(PO (sub 4) ) (sub 11) (PO (sub 3) OH)F (sub 2) , a new member of the arrojadite group from Gemerska Poloma, Slovakia
Mineralogical Magazine (August 2018) 82 (4): 863-876

Abstract

The new mineral fluorarrojadite-(BaNa), ideally BaNa (sub 4) CaFe (sub 13) Al(PO (sub 4) ) (sub 11) (PO (sub 3) OH)F (sub 2) was found on the dump of Elisabeth adit near Gemerska Poloma, Slovakia. It occurs in hydrothermal quartz veins intersecting highly fractionated, topaz-zinnwaldite S-type leucogranite. Fluorarrojadite-(BaNa) is associated with fluorapatite, 'fluordickinsonite-(BaNa)', triplite, viitaniemiite and minor amounts of other minerals. It forms fine-grained irregular aggregates up to 4 cm x 2 cm, which consist of individual anhedral grains up to 0.01 mm in size. It has a yellowish-brown to greenish-yellow colour, very pale yellow streak and a vitreous to greasy lustre. Mohs hardness is approximately 4 (super 1) / (sub 2) to 5. The fracture is irregular and the tenacity is brittle. The measured density is 3.61(2) g cm (super -3) and calculated density is 3.650 g cm (super -3) . Fluorarrojadite-(BaNa) is biaxial (+) and nonpleochroic. The calculated refractive index based on empirical formula is 1.674. The empirical formula (based on 47 O and 3 (OH + F) apfu) is (super A1) (Ba (sub 0.65) K (sub 0.35) ) (sub Sigma 1.00) (super A2) Na (sub 0.35) (super B1) (Na (sub 0.54) Fe (sub 0.46) ) (sub Sigma 1.00) (super B2) Na (sub 0.54) Ca(Ca (sub 0.74) Sr (sub 0.20) Pb (sub 0.02) Ba (sub 0.04) ) (sub Sigma 1.00) Na (sub 2) (super Na3) Na (sub 0.46) (super M) (Fe (sub 7.16) Mn (sub 5.17) Li (sub 0.37) Mg (sub 0.12) Sc (sub 0.08) Zn (sub 0.06) Ga (sub 0.02) Ti (sub 0.02) ) (sub S13.00 ) Al (sub 1.02) P (sub 11) O (sub 44) PO (sub 3.46) (OH) (sub 0.54) (super W) (F (sub 1.54) OH (sub 0.46) ). Fluorarrojadite-(BaNa) is monoclinic, space group Cc, a = 16.563(1) Aa, b = 10.0476(6) Aa, c = 24.669(1) Aa, beta = 105.452(4) degrees , V = 3957.5(4) Aa (super 3) and Z = 4. The seven strongest reflections in the powder X-ray diffraction pattern are [d (sub obs) in Aa, (I), hkl]: 3.412, (21), 116; 3.224, (37), 206; 3.040, (100), 42 (sub 4) ; 2.8499, (22), 33 (sub 3) ; 2.7135, (56), 226; 2.5563, (33), 028 and 424; 2.5117, (23), 040. The new mineral is named according to the nomenclature scheme of arrojadite-group minerals, approved by the IMA CNMNC. In fluorarrojadite-(BaNa), Fe (super 2+) is a dominant cation at the M site (so the root-name is arrojadite) and two suffixes are added to the root-name according to the dominant cation of the dominant valence state at the A1 (Ba (super 2+) ) and B1 sites (Na (super +) ). A prefix fluor is added to the root-name as F- is dominant over (OH) (super -) at the W site.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 82
Serial Issue: 4
Title: Fluorarrojadite-(BaNa), BaNa (sub 4) CaFe (sub 13) Al(PO (sub 4) ) (sub 11) (PO (sub 3) OH)F (sub 2) , a new member of the arrojadite group from Gemerska Poloma, Slovakia
Affiliation: National Museum, Department of Mineralogy and Petrology, Prague, Czech Republic
Pages: 863-876
Published: 201808
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 23
Accession Number: 2019-002282
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N48°27'00" - N48°27'00", E20°19'00" - E20°19'00"
Secondary Affiliation: Comenius University, SVK, SlovakiaUniversita di Milano, ITA, ItalyMasaryk University, CZE, Czech Republic
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2019
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