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Fluornatromicrolite

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Quixaba pegmatite, Quixaba, Frei Martinho, Borborema mineral province, Paraíba, Brazil
© Bruno Gioia

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Formula:
(Na,Ca,Bi)
 
2
Ta
 
2
O
 
6
F
System:IsometricColour:Green
Lustre:AdamantineHardness:5
Member of:Microlite Group > Pyrochlore Supergroup
Name:Named after the chemical composition. It was first approved as a new species by CNMMN, IMA in 1998 (IMA1998-018). But at the time the name was given, although approved, it was not according to the nomenclature at the time (Hogarth 1977). Cause to controversies about the mineral and the nomenclature of the pyrochlore supergroup, the publication was delayed for several years. It was first published by Witzke et al. (2011).
Now the name is according to the new approved nomenclature of the pyrochlore supergroup (Atencio et al. 2010).


A mineral of the Microlite group with fluorine dominant at the second anion site.

Classification of Fluornatromicrolite

IMA status:Approved 1998
Nickel-Strunz 10th (pending) edition ID:4.DH.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
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Type Occurrence of Fluornatromicrolite

Type Locality:Quixaba pegmatite, Quixaba, Frei Martinho, Borborema mineral province, Paraíba, Brazil
Place of Conservation of Type Material:In the Mineralogical Collection of the Bergakademie Freiberg, Germany (No. 77975) and in the Mineralogical Collection of the Martin-Luther Universität Halle, Institut für Geologische Wissenschsften (No. 010356)
Geological Setting of type material:Granite pegmatite
Associated Minerals at type locality:
Albite

Physical Properties of Fluornatromicrolite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:Green
Streak:White
Hardness (Mohs):5
Tenacity:Brittle
Cleavage:None Observed
Cleavage not discernible
Density (measured):6.49(6) g/cm3
Comment:Calculated density for Z=8 is 6.568g/cm�. The difference betwen the calculated and the measured density may be due to the small quantity of the mineral used.

Crystallography of Fluornatromicrolite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m {F41/d 3 2/m}
Space Group Setting:Fd3m
Cell Parameters:a = 10.4451(2) Å
Unit Cell Volume:V 1139.56 ų
Morphology:Regular to flattened octahedral crystals

Optical Data of Fluornatromicrolite

Type:Isotropic

Chemical Properties of Fluornatromicrolite

Formula:
(Na,Ca,Bi)
 
2
Ta
 
2
O
 
6
F
Essential elements:F, Na, O, Ta
All elements listed in formula:Bi, Ca, F, Na, O, Ta

Relationship of Fluornatromicrolite to other Species

Member of:Microlite Group > Pyrochlore Supergroup
Other Members of Group:

- +
Fluorcalciomicrolite
(Ca,Na)
 
2
(Ta,Nb)
 
2
O
 
6
F
Hydrokenomicrolite
(◻,H
 
2
O)
 
2
Ta
 
2
(O,OH)
 
6
(H
 
2
O)
Hydromicrolite
(H
 
2
O,◻)
 
2
Ta
 
2
(O,OH)
 
6
(H
 
2
O)
Hydroxycalciomicrolite
(Ca,Na)
 
2
(Ta,Nb)
 
2
O
 
6
(OH,F)
Hydroxykenomicrolite
(◻,Na,Sb
3+
 
)
 
2
Ta
 
2
O
 
6
(OH)
Kenoplumbomicrolite
(Pb,◻)
 
2
Ta
 
2
O
 
6
(◻,O,OH)
Oxycalciomicrolite
Ca
 
2
Ta
 
2
O
 
6
O
Oxystannomicrolite
Sn
 
2
Ta
 
2
O
 
6
O
Oxystibiomicrolite
(Sb
3+
 
,Ca)
 
2
Ta
 
2
O
 
6
O
Common Associates:
Albite
Related Minerals - Nickel-Strunz Grouping):

- +
4.DH.05Brannerite
(U
4+
 
,REE,Th,Ca)(Ti,Fe
3+
 
,Nb)
 
2
(O,OH)
 
6
4.DH.05Orthobrannerite
U
4+
 
U
6+
 
Ti
 
4
O
 
12
(OH)
 
2
4.DH.05Thorutite
(Th,U,Ca)Ti
 
2
(O,OH)
 
6
4.DH.10Kassite
CaTi
 
2
O
 
4
(OH)
 
2
4.DH.10Lucasite-(Ce)
CeTi
 
2
(O,OH)
 
6
4.DH.15Bariomicrolite (of Hogarth 1977)
4.DH.15Bariopyrochlore (of Hogarth 1977)
4.DH.15Betafite (of Hogarth 1977)
4.DH.15Bismutomicrolite (of Hogarth 1977)
4.DH.15Calciobetafite (of Mazzi & Munno)
4.DH.15Ceriopyrochlore (of Hogarth 1977)
4.DH.15Cesstibtantite
4.DH.15Jixianite
Pb(W,Fe
3+
 
)
 
2
(O,OH)
 
7
4.DH.15Hydropyrochlore
(H
 
2
O,□)
 
2
Nb
 
2
(O,OH)
 
6
(H
 
2
O)
4.DH.15Natrobistantite
4.DH.15Plumbopyrochlore (of Skorobogatova et al.)
4.DH.15Plumbomicrolite (of Hogarth 1977)
4.DH.15Plumbobetafite (of Hogarth 1977)
4.DH.15Stibiomicrolite (of Groat et al.)
4.DH.15Strontiopyrochlore (of Hogarth 1977)
4.DH.15Stannomicrolite (of Hogarth 1977)
4.DH.15Stibiobetafite (of Černý et al.)
4.DH.15Uranpyrochlore (of Hogarth 1977)
(U,Ca,Ce)
 
2
(Nb,Ta)
 
2
O
 
6
(OH,F)
4.DH.15Yttrobetafite (of Hogarth 1977)
4.DH.15Yttropyrochlore (of Hogarth 1977)
4.DH.15Bismutopyrochlore (of Chukanov et al.)
4.DH.15Hydrokenoelsmoreite
◻
 
2
W
 
2
O
 
6
(H
 
2
O)
4.DH.20Bismutostibiconite
Bi(Sb
5+
 
,Fe
3+
 
)
 
2
O
 
7
4.DH.20Oxyplumboroméite
Pb
 
2
Sb
 
2
O
 
6
O
4.DH.20Monimolite
4.DH.20Cuproroméite
Cu
 
2
Sb
 
2
(O,OH)
 
7
4.DH.20Stetefeldtite
Ag
 
2
Sb
 
2
(O,OH)
 
7
4.DH.20Stibiconite
4.DH.25Rosiaite
PbSb
5+
2
O
 
6
4.DH.30Zirconolite
CaZrTi
 
2
O
 
7
4.DH.35Liandratite
U(Nb,Ta)
 
2
O
 
8
4.DH.35Petscheckite
UFe(Nb,Ta)
 
2
O
 
8
4.DH.40Ingersonite
Ca
 
3
MnSb
 
4
O
 
14
4.DH.45Pittongite
Na
 
0.22
(W,Fe
3+
 
)(O,OH)
 
3
 · 0.44H
 
2
O

Other Names for Fluornatromicrolite

Synonyms:
Bismutomicrolite (of Zalashkova & Kukharchik 1957)IMA1998-018
Other Languages:
German:Fluornatromikrolith

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Fluornatromicrolite

Reference List:

- +
Witzke, T., Steins, M., Doering, T., Schuckmann, W., Wegner, R., Pöllmann, H. (2011): Fluornatromicrolite, (Na,Ca,Bi)2Ta2O6F, a new mineral from Quixaba, Paraíba, Brazil. Canadian Mineralogist, 49, 1105-1110.

Internet Links for Fluornatromicrolite

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  • Raman and XRD data at RRUFF project
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    • Localities for Fluornatromicrolite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Afghanistan
     
    • Konar Province (Kunar Province; Konarh Province; Konarha Province; Nuristan)
      • Chapa Dara District
    		Rob Lavinsky photo
    • Nuristan Province (Nurestan Province; Nooristan Province; Nuristan)
      • Kamdesh District
    		Lyckberg, P. (2011): Edelstein-Pegmatite in Afghanistan: Paprok. Mineralien-Welt. 22 (3): 46-57
    Argentina
     
    • Salta
      • Nevados de Palermo
        • El Quemado District
    		Márquez-Zavalía, M. F., Galliski, M. Á., Černý, P., & Chapman, R. (2012). An Assemblage Of Bismuth-Rich, Tellurium-Bearing Minerals In The El Quemado Granitic Pegmatite, Nevados De Palermo, Salta, Argentina. The Canadian Mineralogist, 50(6), 1489-1498.
    Brazil
     
    • Paraíba
      • Borborema mineral province
        • Frei Martinho
          • Quixaba
    		Pavel M. Kartashov data
    Finland
     
    • Western and Inner Finland Region
      • Orivesi
        • Eräjärvi area
    		Pavel M. Kartashov analytical data (2012), Ilkka Mikkola specimen
    Mozambique
     
    • Zambezia Province
      • Alto Ligonha District
    		Mineralogical Record (2001) 32:252
    Pakistan
     
    • Gilgit-Baltistan (Northern Areas)
      • Baltistan
        • Skardu District
    		Pavel M. Kartashov analytical data
    Russia
     
    • Urals Region
      • Middle Urals
        • Sverdlovskaya Oblast'
          • Yuzhakovo Village
            • Alabashka pegmatite field
    		P.M. Kartashov data
    USA
     
    • Maine
      • Oxford Co.
        • Buckfield
    		King, V., and Foord, E., 2000, Mineralogy of Maine
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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