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Hydroxycalciomicrolite

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About HydroxycalciomicroliteHide

Formula:
Ca1.5Ta2O6(OH)
Colour:
Yellow, possibly also brown
Lustre:
Vitreous, Resinous
Hardness:
5 - 6
Specific Gravity:
6.176 (Calculated)
Crystal System:
Isometric
Name:
Named in allusion to chemistry and adherence to the microlite group of the pyrochlore supergroup.
The mineral is interesting in being the first natural pyrochlore-supergroup species with long range ordering of Ca and ◻ on the A sites, that invokes reduction of symmetry.

Chemically similar minerals include rynersonite, calciotantite, 'oxycalciomicrolite', and 'ungursaite'.


Classification of HydroxycalciomicroliteHide

Approved
Approval Year:
2013
First Published:
2017

Physical Properties of HydroxycalciomicroliteHide

Vitreous, Resinous
Transparency:
Translucent
Colour:
Yellow, possibly also brown
Streak:
White
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
6.176 g/cm3 (Calculated)

Optical Data of HydroxycalciomicroliteHide

Type:
Isotropic
RI values:
n = 2.010
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High

Chemical Properties of HydroxycalciomicroliteHide

Formula:
Ca1.5Ta2O6(OH)

IMA Formula:
Ca1.5Ta2O6(OH)
Common Impurities:
Nb,F

Chemical AnalysisHide

Oxide wt%:
 234
Na2O0,61 %0,59 %0 %
CaO14,07 %14,24 %4,95 %
UO216,74 %15,51 %15,56 %
ThO20 %0,19 %0,04 %
TiO25,51 %4,98 %5,23 %
Fe2O30,95 %0,81 %0,78 %
Nb2O518,60 %18,09 %18,23 %
Ta2O541,48 %41,66 %39,75 %
H2O2,04 %3,41 %15,47 %
Total:96 %95 %96 %
Empirical formulas:
Sample IDEmpirical Formula
1(Ca1.48Na0.06Mn0.01)Σ1.55(Ta1.88Nb0.11Sn0.01)Σ2.00O6.00[(OH)0.76F0.20O0.04]
2[Ca1.23U0.30(H2O)0.21Na0.10]?1.84(Ta0.92Nb0.68Ti0.34Fe0.06)?2O6.00[(OH)0.69O0.31]?1.00 on the basis of Nb+Ti+Ta+Fe=2
Sample references:
IDTypeLocalityReference
1Type SpecimenVolta Grande mine, Nazareno, Minas Gerais, BrazilAndrade, M.B., Yang, H., Atencio, D., Downs, R.T., Chukanov, N.V., Lemée-Cailleau, M.H., Persiano, A.I.C., Goeta, A.E., Ellena, J. (2017): Hydroxycalciomicrolite, Ca1.5Ta2O6(OH), a new member of the microlite group from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineralogical Magazine: 81: 555-564
2Atagoyama, Fukushima Prefecture, Tohoku Region, Honshu Island, JapanMatsubara, 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.
3  "  "  "  "
4  "  "  "  "

Crystallography of HydroxycalciomicroliteHide

Crystal System:
Isometric
Class (H-M):
4 3 2 - Gyroidal
Space Group:
P42 3 2
Setting:
P42 3 2
Cell Parameters:
a = 10.4205(8) Å
Unit Cell V:
1131.53 ų
Z:
8
Morphology:
Octahedrons and cubo-octahedrons

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.025(100)
3.145(15)
3.010(73)
2.606(7)
2.006(7)
1.843(8)
1.572(5)
1.505(4)

Occurrences of HydroxycalciomicroliteHide

Paragenetic Mode(s):

Type Occurrence of HydroxycalciomicroliteHide

General Appearance of Type Material:
Isolated octahedra and crystals combining octahedra and rhombic dodecahedra, up to 1.5 mm
Place of Conservation of Type Material:
In the collections of the Museu de Geociências, Instituto de Geociências, Universidade de São Paulo,São Paulo, Brazil, sample number DR917, and at the RRUFF Project, deposition number R130269
Empirical Formula of Type Material:
(Ca1.48Na0.06Mn0.01)Σ1.55(Ta1.88Nb0.11Sn0.01)Σ2.00O6.00[(OH)0.76F0.20O0.04]
Geological Setting of Type Material:
A pegmatite
Reference:
Andrade, M.B., Yang, H., Atencio, D., Downs, R.T., Chukanov, N.V., Lemée-Cailleau, M.H., Persiano, A.I.C., Goeta, A.E., Ellena, J. (2017): Hydroxycalciomicrolite, Ca1.5Ta2O6(OH), a new member of the microlite group from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineralogical Magazine, 81: 555-564

Synonyms of HydroxycalciomicroliteHide

Relationship of Hydroxycalciomicrolite to other SpeciesHide

Other Members of this group:
Fluorcalciomicrolite(Ca,Na)2(Ta,Nb)2O6FIso. m3m (4/m 3 2/m) : Fd3m
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)
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

Common AssociatesHide

Associated Minerals Based on Photo Data:
Columbite-(Mn)5 photos of Hydroxycalciomicrolite associated with Columbite-(Mn) on mindat.org.
Orthoclase4 photos of Hydroxycalciomicrolite associated with Orthoclase on mindat.org.
Muscovite2 photos of Hydroxycalciomicrolite associated with Muscovite on mindat.org.
Quartz1 photo of Hydroxycalciomicrolite associated with Quartz on mindat.org.

Other InformationHide

IR Spectrum:
O-H stretching vibration bands present
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 HydroxycalciomicroliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Andrade, M.B., Yang, H., Atencio, D., Downs, R.T., Chukanov, N.V., Lemée-Cailleau, M.-H., Persiano, A.I.C., Goeta, A.E. and Ellena, J. (2013) Hydroxycalciomicrolite, IMA 2013-073. CNMNC Newsletter No. 18,December 2013, page 3252; Mineralogical
Magazine: 77: 3249-3258.
Andrade, M.B., Yang, H., Atencio, D., Downs, R.T., Chukanov, N.V., Lemée-Cailleau, M.H., Persiano, A.I.C., Goeta, A.E., Ellena, J. (2016): Hydroxycalciomicrolite, Ca1.5Ta2O6(OH), a new member of the microlite group from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. Mineralogical Magazine: 81: 555-564.

Internet Links for HydroxycalciomicroliteHide

Localities for HydroxycalciomicroliteHide

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.
Australia
 
  • Western Australia
    • Port Hedland Shire
      • Abydos Station
        • Wodgina
Hogarth, D. (1961) A Study of Pyrochlore and Betafite, Canadian Mineralogist, v. 6, p. 610-633.
Brazil (TL)
 
  • Minas Gerais
    • Nazareno
Andrade, M.B., Yang, H., Atencio, D., Downs, R.T., Chukanov, N.V., Lemée-Cailleau, M.-H., Persiano, A.I.C., Goeta, A.E. and Ellena, J. (2013) Hydroxycalciomicrolite, IMA 2013-073. CNMNC Newsletter No. 18,December 2013, page 3252; Mineralogical Magazine, 77, 3249-3258
Democratic Republic of the Congo
 
  • Katanga (Shaba)
Pavel M. Kartashov analythical data of 2015
Finland
 
  • Western and Inner Finland Region
    • Orivesi
      • Eräjärvi area
Ilkka Mikkola collection, Pavel Kartashov identification
Japan
 
  • Honshu Island
    • Tohoku Region
      • Fukushima Prefecture
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.
Norway
 
  • Aust-Agder
    • Iveland
Bjørlykke, H.(1933): Norwegische mikrolithmineralen. Norsk Geologisk Tidsskrift 14, 145-161.
Russia
 
  • Urals Region
    • Middle Urals
      • Sverdlovskaya Oblast'
        • Ekaterinburg (Sverdlovsk)
          • Malyshevo
            • Izumrudnye Kopi area
Pavel M. Kartashov analytical data (2012)
Slovakia
 
  • Košice Region
    • Rožňava Co.
      • Dobšiná mining district (Dobschau; Topschau)
Uher P., Bačík P., Števko M., Chládek Š., Fridrichová J. (2018): Elbaite-bearing, Nb-Ta-rich granitic pegmatite from Dobšiná, Gemeric Unit, Eastern Slovakia: the first documented occurrence in the Western Carpathians. Joint 5th Central-European Mineralogical Conference and 7th Mineral Sciences in the Carpathians Conference, Book of Abstracts, 109.
  • Trnava Region
    • Piešťany Co.
Uher, P., Bačík, P., Ozdín, D., & Števko, M. (2012). Beryl in granitic pegmatites of the Western Carpathians (Slovakia): compositional variations, mineral inclusions and breakdown products. Acta Mineralogica-Petrographica, Abstract Series, Szeged, 7, 144.
Mineral and/or Locality  
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