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Fluorcalciomicrolite

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About FluorcalciomicroliteHide

Formula:
(Ca,Na)2(Ta,Nb)2O6F
Colour:
Colourless
Lustre:
Adamantine, Resinous
Hardness:
4 - 5
Specific Gravity:
6.160 (Calculated)
Crystal System:
Isometric
Name:
Named according to convention, for its dominant fluorine and calcium content, and for its relationship to other microlite group minerals.
Unique combination of elements. The (Ca,Na)-analogue of fluornatromicrolite. The Ta analogue of fluorcalciopyrochlore.


Classification of FluorcalciomicroliteHide

Approved
Approval Year:
2012
First Published:
2013

Physical Properties of FluorcalciomicroliteHide

Adamantine, Resinous
Transparency:
Translucent
Colour:
Colourless
Streak:
White
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
6.160 g/cm3 (Calculated)

Optical Data of FluorcalciomicroliteHide

Type:
Isotropic
RI values:
n = 1.992
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High

Chemical Properties of FluorcalciomicroliteHide

Formula:
(Ca,Na)2(Ta,Nb)2O6F
IMA Formula:
(Ca,Na,◻)2Ta2O6F
Idealised Formula:
(Ca,Na)2Ta2(O,OH)6F
Common Impurities:
Na,Nb,OH

Crystallography of FluorcalciomicroliteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 10.4191(6) Å
Unit Cell V:
1131.07 ų
Z:
8
Twinning:
Not observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.997Å(59)
3.138Å(83)
3.005Å(100)
2.602Å(29)
2.004Å(23)
1.841Å(23)
1.589Å(25)
1.504Å(24)

Geological EnvironmentHide

Geological Setting:
Harding pegmatite, New Mexico, USA

Type Occurrence of FluorcalciomicroliteHide

General Appearance of Type Material:
Octahedral crystals up to 1.5 cm, sometimes modified by rhombododecahedral faces
Place of Conservation of Type Material:
In the collections of the Museu de Geociências, Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil, registration number DR731.
Empirical Formula of Type Material:
(Ca1.07Na0.810.12)Σ2.00(Ta1.84Nb0.14Sn0.02)Σ2.00[O5.93(OH)0.07]Σ6.00[F0.79(OH)0.21]Σ1.00
Geological Setting of Type Material:
Accessory mineral in a pegmatite
Associated Minerals at Type Locality:
Reference:
Andrade, M. B., Atencio, D., Persiano, A. I. C., & Ellena, J. (2013). Fluorcalciomicrolite,(Ca, Na,□)2Ta2O6F, a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineralogical Magazine: 77(7): 2989-2996.

Synonyms of FluorcalciomicroliteHide

Varieties of FluorcalciomicroliteHide

Titan-uranoan FluorcalciomicroliteMost of specimens of former Tantalbetafite (of Kalita & Bykova) had turned out Titan-uranoan Fluorcalciomicrolites.

Relationship of Fluorcalciomicrolite to other SpeciesHide

Other Members of this group:
Fluornatromicrolite(Na1.5Bi0.5)Ta2O6FIso. m3m (4/m 3 2/m) : Fd3m
Hydrokenomicrolite(◻,H2O)2Ta2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m)
Hydromicrolite(H2O,◻)2Ta2(O,OH)6(H2O)
HydroxycalciomicroliteCa1.5Ta2O6(OH)Iso. 4 3 2 : P42 3 2
Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH)Iso.
Hydroxynatromicrolite(Na,Bi3+,◻)2Ta2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
Kenoplumbomicrolite(Pb,◻)2Ta2O6(◻,OH,O)Iso.
OxycalciomicroliteCa2Ta2O6O
OxystannomicroliteSn2Ta2O6O
Oxystibiomicrolite(Sb3+,Ca)2Ta2O6O
Yttromicrolite (of Hogarth)(Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7Iso. m3m (4/m 3 2/m) : Fd3m

Fluorescence of FluorcalciomicroliteHide

Other InformationHide

IR Spectrum:
3600–3581 cm–1, doublet (OH groups)
Notes:
Raman bands [cm-1]: 168, 187, 792, 891 (not assigned); 292, 331, 417 (X–B–X bending modes); 505, 664
(B–X octahedral bond stretching)
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for FluorcalciomicroliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Atencio, D., Andrade, M.B., Christy, A.G., Gieré, R., and Kartashov P.M. (2010) The Pyrochlore Supergroup of Minerals: Nomenclature. Canadian Mineralogist: 48: 673-698.
Andrade, M.B., Atencio, D., Yang, H., Downs, R.T., Persiano, A.I.C., and Ellena, J. (2012) Fluorcalciomicrolite, IMA 2012-036. CNMNC Newsletter No. 14, October 2012, page 1286; Mineralogical Magazine: 76: 1281-1288.
Christy, A.G. and Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.
Andrade, M.B., Atencio, D., Persiano, A.I.C., and Ellena, J. (2013) Fluorcalciomicrolite, (Ca,Na,□)2Ta2O6F, a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineralogical Magazine: 77(7): 2989-2996.

Internet Links for FluorcalciomicroliteHide

Localities for FluorcalciomicroliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Minas Gerais
    • Governador Valadares
Pavel M. Kartashov analytical data (2012)
    • Nazareno
Andrade, M.B., Atencio, D., Yang, H., Downs, R.T., Persiano, A.I.C. and Ellena, J. (2012): Fluorcalciomicrolite, IMA 2012-036. CNMNC Newsletter No. 14, October 2012, page 1286; Mineralogical Magazine, 76, 1281-1288; Andrade, M. B., Atencio, D., Persiano, A. I. C., & Ellena, J. (2013). Fluorcalciomicrolite,(Ca, Na,□)2Ta2O6F, a new microlite-group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineralogical Magazine: 77(7): 2989-2996.
Canada
 
  • Manitoba
    • Red Cross Lake
Cerny et al. 2012; Černý, O., Teertstra, D.K., Chapman, R., Selway, J.B., Hawthorne, F.C., Ferreira, K., Chackowsky, L.E., Wang, X.J. & and Meintzer, R.E. (2012)
China
 
  • Henan
    • Sanmenxia
      • Lushi County
        • Guanpo
          • Guanpo pegmatite field
Fan G., Li G., Shen G., Xu J., Dai J. (2013): Luanshiweiite: A New Member of Lepidolite Series. Acta Mineralogica Sinica, 33, 713-721.
Czech Republic
 
  • South Bohemian Region
    • Český Krumlov District
Novák, M., Ertl, A., Povondra, P., Vašinová Galiová, M., Rossman, G. R., Pristacz, H., ... & Škoda, R. (2013). Darrellhenryite, Na (LiAl2) Al6 (BO3) 3Si6O18 (OH) 3O, a new mineral from the tourmaline supergroup. American Mineralogist, 98(10), 1886-1892.
Eswatini
 
  • Lubombo Region
    • Sinceni Mtn
      • Sinceni West area
Grew, E.S., Bosi, F., Ros, L., Kristiansson, P., Gunter, M.E., Hålenius, U., Trumbull, R.B., Yates, M.G. (2018): Fluor-elbaite, lepidolite and Ta-Nb oxides from a pegmatite of the 3000 Ma Sinceni Pluton, Swaziland: evidence for lithium-cesium-tantalum (LCT) pegmatites in the Mesoarchean. European Journal of Mineralogy 30, 205-218.
Finland
 
  • Pirkanmaa
    • Orivesi
      • Eräjärvi area
Ilkka Mikkola collection, Pavel Kartashov identification
  • Tavastia Proper
    • Forssa
Pavel M. Kartashov analytical data, Ilkka Mikkola specimen
Hungary
 
  • Borsod-Abaúj-Zemplén County
    • Miskolc District
      • Bükkszentkereszt
Gál P. (2014): Titán-, nióbium és tantálásványok a Bagolyhegyi Metariolit Formáció (Bükk) képződményeiben. TDK dolgozat, kézirat, ME
Japan
 
  • Fukuoka prefecture
    • Munakata City
Uehara, S., et al. (2014) Minerals from Kyushu and Yamaguchi. (Fukuoka Mineral Club, 355 pages)
  • Ibaraki Prefecture
    • Hitachiota City
Matsubara, S., Miyawaki, R., Yokoyama, K., Momma, K., Shigeoka, M., and Hashimoto, E. (2013) Pyrochlore and microlite in a pegmatite at Atagoyama, Koriyama City, Fukushima Prefecture, Japan. Bulletin of the National Museum of Nature and Science, Ser. C, 39, 1–6.
Mozambique
 
  • Zambezia Province
    • Alto Ligonha District
RRUFF ID: R130022
Slovakia
 
  • Bratislava Region
    • Bratislava
      • Bratislava
        • Devín
Chudík P., Uher P., Gadas P., Škoda R., Pršek J., 2011: Niobium-tantalum oxide minerals in the Jezuitské Lesy granitic pegmatite, Bratislava Massif, Slovakia: To to Nb and Fe to Mn evolutionary trends in narrow Be, Cs-rich and Li, B-poor dike. Mineralogy and Petrology, 101, Special Issue: Accessory Minerals.
USA
 
  • Virginia
    • Amelia Co.
Palache, C. and Gonyer, F., (1940), Microlite and Stibiotantalite from Topsham, Maine, American Mineralogist, v. v. 25, p. 411-417. (complete chemical analysis)
 
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