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Hydroxycalciomicrolite

A valid IMA mineral species
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07435180014946990621310.jpg
Hydroxycalciomicrolite

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
00398920014948515519041.jpg
Hydroxycalciomicrolite, etc.

Krasnoarmeiskii mine, Izumrudnye Kopi area, Malyshevo, Sverdlovsk Oblast, Russia
06391530016753467449858.jpg
Hydroxycalciomicrolite, etc.

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
05424700014946990596778.jpg
Hydroxycalciomicrolite

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
00398920014948515519041.jpg
Hydroxycalciomicrolite, etc.

Krasnoarmeiskii mine, Izumrudnye Kopi area, Malyshevo, Sverdlovsk Oblast, Russia
06391530016753467449858.jpg
Hydroxycalciomicrolite, etc.

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
07435180014946990621310.jpg
Hydroxycalciomicrolite

Fisher Quarry, Topsham, Sagadahoc County, Maine, USA
00398920014948515519041.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 ◻ 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
GUID
(UUID V4):
fdd825b8-f26c-4e24-b8e2-6a2631d82d2f

Classification of HydroxycalciomicroliteHide

IMA status:
Approved
Approval year:
2013
First published:
2017
Type description 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
Strunz-mindat (2023):
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
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
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High

Chemical Properties of HydroxycalciomicroliteHide

Formula:
Ca1.5Ta2O6(OH)

IMA Formula:
Ca1.5Ta2O6(OH)
Elements listed:
Ca, H, O, Ta - search for minerals with similar chemistry
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:
IDTypeLocalityReferenceNotes
1Type SpecimenVolta Grande mine, Nazareno, Minas Gerais, BrazilAndrade, M.B., Yang, H., Atencio, D., Downs, R.T., Chukanov, N.V., Lem
2Atagoyama, Koriyama City, Fukushima Prefecture, 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  "  "
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 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: 555-564

Synonyms of HydroxycalciomicroliteHide

Relationship of Hydroxycalciomicrolite to other SpeciesHide

Member of:
Microlite Group > Pyrochlore Supergroup
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. m3m (4/m 3 2/m) : Fd3m
Hydroxynatromicrolite(Na,Bi3+,◻)2Ta2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
Kenoplumbomicrolite(Pb,◻)2Ta2O6(◻,OH,O)Iso.
Oxybismutomicrolite(Bi1.33◻0.67)Σ2Ta2O6OIso. m3m (4/m 3 2/m) : Fd3m
OxycalciomicroliteCa2Ta2O6OIso. m3m (4/m 3 2/m) : Fd3m
OxystannomicroliteSn2Ta2O6OIso. m3m (4/m 3 2/m) : Fd3m
Oxystibiomicrolite(Sb3+,Ca)2Ta2O6OIso. m3m (4/m 3 2/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/m 3 2/m) : Fd3m

Common AssociatesHide

Associated Minerals 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 CleavelanditeNa(AlSi3O8)
1 photo of Hydroxycalciomicrolite associated with MuscoviteKAl2(AlSi3O10)(OH)2
1 photo of Hydroxycalciomicrolite associated with AlbiteNa(AlSi3O8)

Related Minerals - Strunz-mindat GroupingHide

4.DH.Fluornatropyrochlore(Na,Pb,Ca,REE,U)2Nb2O6FIso. m3m (4/m 3 2/m)
4.DH.Roméite GroupA2(Sb5+)2O6Z
4.DH.Hydroxykenomicrolite(◻,Na,Sb3+)2Ta2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.Fluornatroroméite(Na,Ca)2Sb2(O,OH)6F
4.DH.OxyplumboroméitePb2Sb2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.Cesiokenopyrochlore◻Nb2(O,OH)6(Cs,◻) Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.Oxyyttrobetafite-(Y)Y2Ti2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.05BranneriteUTi2O6Mon. 2/m : B2/m
4.DH.05OrthobranneriteU4+U6+Ti4O12(OH)2Orth.
4.DH.05Thorutite(Th,U,Ca)Ti2(O,OH)6Mon.
4.DH.10KassiteCaTi2O4(OH)2Mon. 2/m : P21/b
4.DH.10Lucasite-(Ce)CeTi2(O,OH)6Mon.
4.DH.15 vaAlumotungstite◻2W2O6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Bismutomicrolite (of Hogarth 1977)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Hydroplumboelsmoreite(Pb,◻)(W,Fe3+)2O6 · H2OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Hydropyrochlore(H2O,◻)2Nb2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Plumbomicrolite (of Hogarth 1977)
4.DH.15Stibiomicrolite (of Groat et al.)
4.DH.15Strontiopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Fluornatromicrolite(Na1.5Bi0.5)Ta2O6FIso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Bismutopyrochlore (of Chukanov et al.)(Bi,Ca,U,Pb)2-xNb2(O,OH)6(OH)Amor.
4.DH.15Hydrokenoelsmoreite◻2W2O6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Fluorcalciomicrolite(Ca,Na)2(Ta,Nb)2O6FIso. m3m (4/m 3 2/m) : Fd3m
4.DH.15OxycalciobetafiteCa2(Ti,Nb)2O6O
4.DH.15 vaYttromicrolite (of Hogarth)(Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Oxynatropyrochlore(Na,Ca,U)2Nb2O6(O,OH)
4.DH.15Hydroxycalciopyrochlore(Ca,Na,U,◻)2(Nb,Ti)2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Fluorcalciopyrochlore(Ca,Na)2(Nb, Ti)2O6FIso.
4.DH.15OxycalciopyrochloreCa2Nb2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Fluorstrontiopyrochlore(Sr,◻)2Nb2(O,OH)6F
4.DH.15OxyplumbopyrochlorePb2Nb2O6O
4.DH.15Kenoplumbopyrochlore(Pb,◻)Nb2O6(◻,O)
4.DH.15Oxyyttropyrochlore-(Y)(Y,◻)2Nb2O6O
4.DH.15Fluorkenopyrochlore(◻,Sr,Ce,Ca,Na)2(Nb,Ti)2O6F
4.DH.15Oxyuranobetafite(U,Ca,◻)2(Ti,Nb)2O6O
4.DH.15OxycalciomicroliteCa2Ta2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.15OxystannomicroliteSn2Ta2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Kenoplumbomicrolite(Pb,◻)2Ta2O6(◻,OH,O)Iso.
4.DH.15Oxystibiomicrolite(Sb3+,Ca)2Ta2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Hydromicrolite(H2O,◻)2Ta2(O,OH)6(H2O)
4.DH.15Hydrokenomicrolite(◻,H2O)2Ta2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m)
4.DH.15Hydroxymanganopyrochlore(Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) Iso. m3 (2/m 3)
4.DH.15Fluorplumbopyrochlore(Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6FIso.
4.DH.15Hydroxyplumbopyrochlore (Pb1.5◻0.5)Nb2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Oxynatromicrolite(Na,Ca,U)2(Ta,Nb)2O6(O,F)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Fluorhydropyrochlore
4.DH.15Hydroxykenoelsmoreite(◻,Pb)2(W,Fe3+,Al)2(O,OH)6(OH)Trig. 3 : R3
4.DH.15Hydrokenopyrochlore(◻,x)2Nb2O6(H2O,Cs)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Hydroxykenopyrochlore(◻,Ce,Ba)2(Nb,Ti)2O6(OH,F)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Hydroxynatropyrochlore(Na,Ca,Ce)2Nb2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Hydroxynatromicrolite(Na,Bi3+,◻)2Ta2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.15Unnamed (Sb-analogue of Hydroxymanganopyrochlor)(Mn,Ca,Y)2(Sb,Ti)2O6(OH)
4.DH.15Oxybismutomicrolite(Bi1.33◻0.67)Σ2Ta2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.20BindheimitePb2Sb2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.20Hydroxycalcioroméite(Ca,Sb3+)2(Sb5+,Ti)2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.20MonimolitePb2Sb5+2O7Iso. m3m (4/m 3 2/m)
4.DH.20CuproroméiteCu2Sb2(O,OH)7Iso.
4.DH.20StetefeldtiteAg2Sb2(O,OH)7Iso.
4.DH.20StibiconiteSb3+Sb5+2O6(OH) Iso. m3m (4/m 3 2/m)
4.DH.20Fluorcalcioroméite(Ca,Na,◻)2Sb5+2(O,OH)6FIso. m3m (4/m 3 2/m) : Fd3m
4.DH.20OxycalcioroméiteCa2Sb2O6OIso. m3m (4/m 3 2/m) : Fd3m
4.DH.20Hydroxyferroroméite(Fe2+1.5◻0.5)Sb5+2O6(OH)Iso. m3m (4/m 3 2/m) : Fd3m
4.DH.25RosiaitePbSb5+2O6Trig. 3m (3 2/m) : P3 1m
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/m 2/m 2/m) : Cmca
4.DH.30Stefanweissite(Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14Orth. mmm (2/m 2/m 2/m) : Cmca
4.DH.35LiandratiteU(Nb,Ta)2O8Trig. 3m (3 2/m) : P3 1m
4.DH.35PetscheckiteUFe(Nb,Ta)2O8Hex.
4.DH.40IngersoniteCa3Mn2+Sb5+4O14Trig. 3 2 : P31 2 1
4.DH.45PittongiteNa0.22(W,Fe3+)(O,OH)3 · 0.44H2OHex. 6 m2 : P6m2
4.DH.50TazzoliiteBa4-xNaxTi2Nb3SiO17[PO2(OH)2]x(OH)(1-2x) Orth. mmm (2/m 2/m 2/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

Reference List:
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.
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

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 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.
Australia
 
  • Western Australia
    • Port Hedland Shire
      • Abydos Station
        • Wodgina
Brazil (TL)
 
  • Minas Gerais
    • Nazareno
DR Congo
 
  • Tanganyika
Finland
 
  • Pirkanmaa
    • Orivesi
      • Eräjärvi area
Italy
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Druogno
        • Orcesco
      • Trontano
        • Cosasca
        • Pizzo Marcio
Japan
 
  • Fukushima Prefecture
    • Koriyama City
Norway
 
  • Agder
    • Iveland
Russia
 
  • Murmansk Oblast
  • Sverdlovsk Oblast
    • Malyshevo
      • Izumrudnye Kopi area
Slovakia
 
  • Košice Region
    • Rožňava District
      • Dobšiná
        • Dobšiná mining district
  • Trnava Region
    • Piešťany District
USA
 
  • Maine
    • Sagadahoc County
      • Topsham
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