J 2018

Fluorarrojadite-(BaNa), BaNa4CaFe13Al(PO4)(11)(PO3OH)F-2, a new member of the arrojadite group from Gemerska Poloma, Slovakia

STEVKO, M., J. SEJKORA, P. UHER, F. CAMARA, Radek ŠKODA et. al.

Basic information

Original name

Fluorarrojadite-(BaNa), BaNa4CaFe13Al(PO4)(11)(PO3OH)F-2, a new member of the arrojadite group from Gemerska Poloma, Slovakia

Authors

STEVKO, M. (703 Slovakia), J. SEJKORA (203 Czech Republic), P. UHER (703 Slovakia), F. CAMARA (380 Italy), Radek ŠKODA (203 Czech Republic, guarantor, belonging to the institution) and Tomáš VACULOVIČ (203 Czech Republic, belonging to the institution)

Edition

Mineralogical Magazine, Middlesex, Mineralogical Society, 2018, 0026-461X

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10504 Mineralogy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 2.210

RIV identification code

RIV/00216224:14310/18:00106689

Organization unit

Faculty of Science

DOI

UT WoS

000452015500006

Keywords in English

fluorarrojadite-(BaNa); new mineral; arrojadite group; phosphates; Raman spectroscopy; S-type granite; Gemerska Poloma; Slovakia

Tags

International impact, Reviewed
Změněno: 23/4/2024 14:40, Mgr. Michal Petr

Abstract

V originále

The new mineral fluorarrojadite-(BaNa), ideally BaNa4CaFe13Al(PO4)(11)(PO3OH)F-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. Fluorannjadite-(BaNa) is associated with fluorapatite,'fluordickinsonite-(BaNa)', triplite, viitaniemiite and minor amounts of other minerals. It forms fme-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. Mobs hardness is similar to 41/2 to 5. The fracture is irregular and the tenacity is brittle. The measured density is 3.61(2) g cm (3) and calculated density is 3.650 g cm (3). Fluorarrojadite-(BaNa) is biaxial (+) and nonpleoclunic. The calculated refractive index based on empirical formula is 1.674. The empirical formula (based on 47 O and 3 (OH + F) apfu) is (A1)(Ba0.65K0.35) Sigma 1.00(A2)Na(0.35)(B)(1)(Na0.54Fe0.46)(Sigma 1.00)Na-B2(0).54(Ca)(Ca0.7Sr0.20Pb0.02Ba0.04)(Sigma 1.00)(Na2Na0.46)-Na-Na3 M(Fe7.16Mn5.17Li0.37Mg0.12SC0.08Zn0.06Ga0.02Ti0.02)Sigma(1)(3.00) Al1.02P11O44PO3.46(OH)(0.54)(F1.54OH0.46).Fluorannjadite-(BaNa) is monoclinic, space group Cc, a = 16.563(1) <(A)overcircle>, b = 10.0476(6) <(A)overcircle>, c = 24.669(1) <(A)overcircle>, p= 105.452(4)degrees, V=3957.5(4) <(A)overcircle>(3) and Z=4. The seven strongest reflections in the powder X-ray diffraction pattern are [d(obs) in <(A)overcircle>, (I) hkl]: 3.412, (21), 116; 3.224, (37), 206; 3.040, (100), 42 (4) over bar; 2.8499, (22), 33 (3) over bar; 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), Fe2+ 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 Al (Ba2+) and B1 sites (Na+). A prefix fluor is added to the root-name as F is dominant over (OH) at the W site.