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Hydroxycalciomicrolite

A valid IMA mineral species
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09920220017272472167231.jpg
Hydroxycalciomicrolite

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
03989480017272316038029.jpg
Hydroxycalciomicrolite, etc.

Krasnoarmeiskii mine, Izumrudnye Kopi area, Malyshevo, Sverdlovsk Oblast, Russia
04009960017272472176923.jpg
Hydroxycalciomicrolite, etc.

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
09920220017272472167231.jpg
Hydroxycalciomicrolite

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
03989480017272316038029.jpg
Hydroxycalciomicrolite, etc.

Krasnoarmeiskii mine, Izumrudnye Kopi area, Malyshevo, Sverdlovsk Oblast, Russia
09046220017272014268854.jpg
Hydroxycalciomicrolite, etc.

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
01638770017272472189155.jpg
Hydroxycalciomicrolite

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
03989480017272316038029.jpg
Hydroxycalciomicrolite, etc.

Krasnoarmeiskii mine, Izumrudnye Kopi area, Malyshevo, Sverdlovsk Oblast, Russia
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About HydroxycalciomicroliteHide

Formula:
Ca1.5Ta2O6(OH)
Colour:
Yellow, brownish, greenish
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 ◻ (vacancies) on the A sites, that invokes reduction of symmetry.

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


Unique IdentifiersHide

Mindat ID:
42907
Long-form identifier:
mindat:1:1:42907:0

IMA Classification of HydroxycalciomicroliteHide

Classification of HydroxycalciomicroliteHide

Strunz-mindat (2026):
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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
HcmicIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of HydroxycalciomicroliteHide

Lustre:
Vitreous, Resinous
Transparency:
Translucent
Colour:
Yellow, brownish, greenish
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
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.
In focus

Chemistry of HydroxycalciomicroliteHide

Mindat Formula:
Ca1.5Ta2O6(OH)
Element Weights:
Element% weight
Ta67.642 %
O20.933 %
Ca11.237 %
H0.188 %

Calculated from ideal end-member formula.
Ta
O
Ca
H
Elements listed:
Ca, H, O, Ta - search for minerals with similar chemistry
Common Impurities:
Nb,F

Chemical AnalysisHide

Oxide wt%:
 123
Na2O0,61 %0,59 %
CaO14,07 %14,24 %4,95 %
UO216,74 %15,51 %15,56 %
ThO20,19 %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
4(Ca1.48Na0.06Mn0.01)Σ1.55(Ta1.88Nb0.11Sn0.01)Σ2.00O6.00[(OH)0.76F0.20O0.04]
1[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:
IDTypeLocalityReferenceNotes
1Atagoyama, Koriyama City, Fukushima Prefecture, Japan
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
2  "  "
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
3  "  "
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
4Type SpecimenVolta Grande mine, Nazareno, Minas Gerais, Brazil
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 (3) 555-564 doi:10.1180/minmag.2016.080.116

Crystallography of HydroxycalciomicroliteHide

Crystal System:
Isometric
Class (H-M):
432 - Gyroidal
Space Group:
P4232
Setting:
P4232
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 Å(100)
3.145 Å(15)
3.010 Å(73)
2.606 Å(7)
2.006 Å(7)
1.843 Å(8)
1.572 Å(5)
1.505 Å(4)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites

Type Occurrence of HydroxycalciomicroliteHide

Type Locality:
ⓘ Volta Grande mine (Mibra mine), Nazareno, Minas Gerais, Brazil
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 (3) 555-564 doi:10.1180/minmag.2016.080.116

Synonyms of HydroxycalciomicroliteHide

Other Language Names for HydroxycalciomicroliteHide

Relationship of Hydroxycalciomicrolite to other SpeciesHide

Member of:
Microlite Group > Pyrochlore Supergroup
Other Members of Microlite Group:
Fluorcalciomicrolite(Ca,Na)2(Ta,Nb)2O6FIso. m3m(4/m32/m) : Fd3m
Fluornatromicrolite(Na1.5Bi0.5)Ta2O6FIso. m3m(4/m32/m) : Fd3m
Hydrokenomicrolite(◻,H2O)2Ta2(O,OH)6(H2O)Iso. m3m(4/m32/m)
'Hydromicrolite'(H2O,◻)2Ta2(O,OH)6(H2O)
Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH,Cs)Iso. m3m(4/m32/m) : Fd3m
'Hydroxylstibiomicrolite'(Sb,Ca,Na)2(Ta,Nb)2O6(OH)Iso.
'Hydroxynatromicrolite'(Na,Bi3+,◻)2Ta2O6(OH)Iso. m3m(4/m32/m) : Fd3m
Kenomicrolite◻2Ta2[O4(OH)2]◻Iso. m3m(4/m32/m) : Fd3m
Kenoplumbomicrolite(Pb,◻)2Ta2O6(◻,OH,O)Iso.
Oxybismutomicrolite(Bi1.33◻0.67)Σ2Ta2O6OIso. m3m(4/m32/m) : Fd3m
OxycalciomicroliteCa2Ta2O6OIso. m3m(4/m32/m) : Fd3m
OxystannomicroliteSn2Ta2O6OIso. m3m(4/m32/m) : Fd3m
Oxystibiomicrolite(Sb3+,Ca)2Ta2O6OIso. m3m(4/m32/m) : Fd3m
'Uranmicrolite (of Hogarth 1977)'(Ca,U,Na)2-x(Ta,Nb)2(O,OH)7Iso.
'Yttromicrolite (of Hogarth)'(Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7Iso. m3m(4/m32/m) : Fd3m

Common AssociatesHide

Associations Based on Photo Data:
5 photos of Hydroxycalciomicrolite associated with Columbite-(Mn)Mn2+Nb2O6
3 photos of Hydroxycalciomicrolite associated with OrthoclaseK(AlSi3O8)
1 photo of Hydroxycalciomicrolite associated with AlbiteNa(AlSi3O8)
1 photo of Hydroxycalciomicrolite associated with MuscoviteKAl2(AlSi3O10)(OH)2
1 photo of Hydroxycalciomicrolite associated with 'Cleavelandite'Na(AlSi3O8)

Related Minerals - Strunz-mindat GroupingHide

4.DH.Cesiokenopyrochlore◻Nb2(O,OH)6(Cs,◻) Iso. m3m(4/m32/m) : Fd3m
4.DH.Roméite GroupA2(Sb5+)2O6Z
4.DH.OxyplumboroméitePb2Sb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.Fluornatropyrochlore(Na,Pb,Ca,REE,U)2Nb2O6FIso. m3m(4/m32/m)
4.DH.BismutostibiconiteBi(Sb5+,Fe3+)2O7Iso. m3m(4/m32/m) : Fd3m
4.DH.Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH,Cs)Iso. m3m(4/m32/m) : Fd3m
4.DH.'Fluornatroroméite'(Na,Ca)2Sb2(O,OH)6F
4.DH.Oxyyttrobetafite-(Y)Y2Ti2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.05Thorutite(Th,U,Ca)Ti2(O,OH)6Mon.
4.DH.05OrthobranneriteU4+U6+Ti4O12(OH)2Orth.
4.DH.05BranneriteUTi2O6Mon. 2/m : B2/m
4.DH.10KassiteCaTi2O4(OH)2Mon. 2/m : P21/b
4.DH.10Lucasite-(La)Mon. 2 : B2
4.DH.10Lucasite-(Ce)CeTi2(O,OH)6Mon.
4.DH.15'Fluorhydropyrochlore'
4.DH.15Hydrokenoelsmoreite◻2W2O6(H2O)Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Hydroxynatromicrolite'(Na,Bi3+,◻)2Ta2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Hydroplumboelsmoreite(Pb,◻)(W,Fe3+)2O6 · H2OIso. m3m(4/m32/m) : Fd3m
4.DH.15Hydropyrochlore(H2O,◻)2Nb2(O,OH)6(H2O)Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Unnamed (Sb-analogue of Hydroxymanganopyrochlor)'(Mn,Ca,Y)2(Sb,Ti)2O6(OH)
4.DH.15Hydroxynatropyrochlore(Na,Ca,Ce)2Nb2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Hydrokenopyrochlore(◻,x)2Nb2O6(H2O,Cs)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Oxybismutomicrolite(Bi1.33◻0.67)Σ2Ta2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15Kenomicrolite◻2Ta2[O4(OH)2]◻Iso. m3m(4/m32/m) : Fd3m
4.DH.15Fluornatromicrolite(Na1.5Bi0.5)Ta2O6FIso. m3m(4/m32/m) : Fd3m
4.DH.15'Oxynatropyrochlore'(Na,Ca,U)2Nb2O6(O,OH)
4.DH.15Hydroxycalciopyrochlore(Ca,Na,U,◻)2(Nb,Ti)2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Fluorcalciopyrochlore(Ca,Na)2(Nb,Ti)2O6FIso.
4.DH.15OxycalciopyrochloreCa2Nb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15'Fluorstrontiopyrochlore'(Sr,◻)2Nb2(O,OH)6F
4.DH.15OxyplumbopyrochlorePb2Nb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15'Fluorplumbopyrochlore'(Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6FIso.
4.DH.15'Bismutomicrolite (of Hogarth 1977)'Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Bismutopyrochlore (of Chukanov et al.)'(Bi,Ca,U,Pb)2-xNb2(O,OH)6(OH)Amor.
4.DH.15'Kenoplumbopyrochlore'(Pb,◻)Nb2O6(◻,O)
4.DH.15Hydroxyplumbopyrochlore (Pb1.5◻0.5)Nb2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Stibiomicrolite (of Groat et al.)'
4.DH.15'Oxyyttropyrochlore-(Y)'(Y,◻)2Nb2O6O
4.DH.15'Fluorkenopyrochlore'(◻,Sr,Ce,Ca,Na)2(Nb,Ti)2O6F
4.DH.15'Strontiopyrochlore (of Hogarth 1977)'(Sr,Ce,Ca)0.66(Nb,Fe)2(O,OH)7
4.DH.15 va'Alumotungstite'◻2W2O6(H2O)Iso. m3m(4/m32/m) : Fd3m
4.DH.15'Oxycalciobetafite'Ca2(Ti,Nb)2O6O
4.DH.15'Oxyuranobetafite'(U,Ca,◻)2(Ti,Nb)2O6O
4.DH.15Fluorcalciomicrolite(Ca,Na)2(Ta,Nb)2O6FIso. m3m(4/m32/m) : Fd3m
4.DH.15OxycalciomicroliteCa2Ta2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15OxystannomicroliteSn2Ta2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15Kenoplumbomicrolite(Pb,◻)2Ta2O6(◻,OH,O)Iso.
4.DH.15Oxynatromicrolite(Na,Ca,U)2(Ta,Nb)2O6(O,F)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Oxystibiomicrolite(Sb3+,Ca)2Ta2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.15'Hydromicrolite'(H2O,◻)2Ta2(O,OH)6(H2O)
4.DH.15'Plumbomicrolite (of Hogarth 1977)'
4.DH.15Hydrokenomicrolite(◻,H2O)2Ta2(O,OH)6(H2O)Iso. m3m(4/m32/m)
4.DH.15Hydroxykenoelsmoreite(◻,Pb)2(W,Fe3+,Al)2(O,OH)6(OH)Trig. 3 : R3
4.DH.15 va'Yttromicrolite (of Hogarth)'(Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7Iso. m3m(4/m32/m) : Fd3m
4.DH.15Hydroxykenopyrochlore(◻,Ce,Ba)2(Nb,Ti)2O6(OH,F)Iso. m3m(4/m32/m) : Fd3m
4.DH.15Hydroxymanganopyrochlore(Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) Iso. m3(2/m3)
4.DH.20'Cuproroméite'Cu2Sb2(O,OH)7Iso.
4.DH.20Hydroxycalcioroméite(Ca,Sb3+)2(Sb5+,Ti)2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.20BindheimitePb2Sb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.20Hydroxyferroroméite(Fe2+1.5◻0.5)Sb5+2O6(OH)Iso. m3m(4/m32/m) : Fd3m
4.DH.20Fluorcalcioroméite(Ca,Na,◻)2Sb5+2(O,OH)6FIso. m3m(4/m32/m) : Fd3m
4.DH.20OxycalcioroméiteCa2Sb2O6OIso. m3m(4/m32/m) : Fd3m
4.DH.20StetefeldtiteAg2Sb2(O,OH)7Iso.
4.DH.20StibiconiteSb3+Sb5+2O6(OH)Iso. m3m(4/m32/m)
4.DH.20MonimolitePb2Sb5+2O7Iso. m3m(4/m32/m)
4.DH.25RosiaitePbSb5+2O6Trig. 3m(32/m) : P31m
4.DH.30Stefanweissite(Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14Orth. mmm(2/m2/m2/m) : Cmca
4.DH.30ZirconoliteCaZrTi2O7Orth.
4.DH.30Laachite(Ca,Mn)2Zr2Nb2TiFeO14Mon. 2/m : B2/b
4.DH.30Nöggerathite-(Ce)(Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14Orth. mmm(2/m2/m2/m) : Cmca
4.DH.35LiandratiteU(Nb,Ta)2O8Trig. 3m(32/m) : P31m
4.DH.35PetscheckiteUFe(Nb,Ta)2O8Hex.
4.DH.40IngersoniteCa3Mn2+Sb5+4O14Trig. 32 : P3121
4.DH.45PittongiteNa0.22(W,Fe3+)(O,OH)3 · 0.44H2OHex. 6m2 : P6m2
4.DH.50TazzoliiteBa4-xNaxTi2Nb3SiO17[PO2(OH)2]x(OH)(1-2x) Orth. mmm(2/m2/m2/m) : Fmmm

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.

Internet Links for HydroxycalciomicroliteHide

References for HydroxycalciomicroliteHide

Localities for HydroxycalciomicroliteHide

Showing 22 localities.

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.
Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Argentina
 
  • La Rioja Province
    • Sanagasta department
Lira et al. (2023)
Australia
 
  • Western Australia
    • Port Hedland Shire
      • Abydos Station
        • Wodgina
Hogarth (1961)
Austria
 
  • Carinthia
    • Villach
      • Markogel
Bojar (2024)
Brazil (TL)
 
  • Minas Gerais
    • Nazareno
Williams et al. (2013)
DR Congo
 
  • Tanganyika
Pavel M. Kartashov analythical data of ...
Finland
 
  • Pirkanmaa
    • Orivesi
      • Eräjärvi area
Ilkka Mikkola collection
  • South Karelia
    • Lappeenranta
Martin et al. (2026)
Italy
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Druogno
        • Orcesco
Vignola et al. (2018)
      • Trontano
        • Cosasca
Vignola et al. (2018)
        • Pizzo Marcio
Vignola et al. (2018)
Vignola et al. (2018)
Vignola et al. (2018)
Japan
 
  • Fukushima Prefecture
    • Koriyama City
Matsubara et al. (2013)
Norway
 
  • Agder
    • Iveland
Bjørlykke (1934) +1 other reference
  • Telemark
    • Drangedal
      • Tørdal
Chukanov et al. (2026)
Russia
 
  • Murmansk Oblast
    • Kolsky District
Zozulya et al. (2024)
    • Kovdorsky District
Ivanyuk et al. (2018)
  • Sverdlovsk Oblast
    • Malyshevo
      • Izumrudnye Kopi area
Pavel M. Kartashov analytical data (2012)
Slovakia
 
  • Košice Region
    • Rožňava District
      • Dobšiná
        • Dobšiná mining district
Uher P. et al. (2018)
  • Trnava Region
    • Piešťany District
Uher et al. (2012)
USA
 
  • Maine
    • Sagadahoc County
      • Topsham
undefined +1 other reference
  • Virginia
    • Amelia County
      • Amelia (Amelia Court House)
Duresky et al. (2025)
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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