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Bariomicrolite (of Hogarth 1977)

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System:
Isometric
Colour:
Yellowish to orangish
Lustre:
Resinous, Dull
Hardness:
4½ - 5
The bariomicrolite species of Hogarth (1977), the rijkeboerite of van der Veen (1963), is too poor in Ba to warrant this name.

The type sample apparently has □ dominant at the A position and H2O at the Y position, and as such is probably hydrokenomicrolite.

The bariomicrolite studied by Beurlen et al. (2005) is probably also hydrokenomicrolite.


Classification of Bariomicrolite (of Hogarth 1977)

Discredited
Approval History:
Approved IMA 1977.
Discredited (Atencio et al. 2013, 2012 IMA Report)
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
8.2.2.2

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
18.1.15

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U

Physical Properties of Bariomicrolite (of Hogarth 1977)

Resinous, Dull
Diaphaneity (Transparency):
Opaque
Colour:
Yellowish to orangish
Hardness (Mohs):
4½ - 5
Hardness (Vickers):
VHN100=485 - 498
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
5.68 - 5.8 g/cm3 (Measured)    5.51 g/cm3 (Calculated)

Optical Data of Bariomicrolite (of Hogarth 1977)

Type:
Isotropic

Crystallography of Bariomicrolite (of Hogarth 1977)

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 10.57 Å
Unit Cell Volume:
V 1,180.93 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Intergrowths with microlite

First Recorded Occurrence of Bariomicrolite (of Hogarth 1977)

General Appearance of First Recorded Material:
Intergrowths with microlite, may be partially metamict
Geological Setting of First Recorded Material:
Alluvial concentrates derived from a pegmatite
Empirical Formula:
(Ba,Fe,U, · · · )=0.31(Ta,Nb,Ti,Sn)=2.00O5.32(H2O)2
Associated Minerals at First Recorded Locality:

Relationship of Bariomicrolite (of Hogarth 1977) to other Species

4.DH.05Brannerite(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
4.DH.05OrthobranneriteU4+U6+Ti4O12(OH)2
4.DH.05Thorutite(Th,U,Ca)Ti2(O,OH)6
4.DH.10KassiteCaTi2O4(OH)2
4.DH.10Lucasite-(Ce)CeTi2(O,OH)6
4.DH.15Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Betafite (of Hogarth 1977)A2-mB2X6-wY1-n
4.DH.15Bismutomicrolite (of Hogarth 1977)
4.DH.15Calciobetafite (of Mazzi & Munno)(Ca,Na)2(Nb,Ti)2(O,OH)7
4.DH.15Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Cesstibtantite
4.DH.15JixianitePb(W,Fe3+)2(O,OH)7
4.DH.15Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)
4.DH.15Natrobistantite
4.DH.15Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
4.DH.15Plumbomicrolite (of Hogarth 1977)
4.DH.15Plumbobetafite (of Hogarth 1977)A2-mB2X6-wY1-n
4.DH.15Stibiomicrolite (of Groat et al.)
4.DH.15Strontiopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Stannomicrolite (of Hogarth 1977)
4.DH.15Stibiobetafite (of Černý et al.)A2-mB2X6-wY1-n
4.DH.15Uranpyrochlore (of Hogarth 1977)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
4.DH.15Yttrobetafite (of Hogarth 1977)A2-mB2X6-wY1-n
4.DH.15Yttropyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Fluornatromicrolite(Na1.5Bi0.5)Ta2O6F
4.DH.15Bismutopyrochlore (of Chukanov et al.)A2Nb2(O,OH)6Z
4.DH.15Hydrokenoelsmoreite2W2O6(H2O)
4.DH.20BismutostibiconiteBi(Sb5+,Fe3+)2O7
4.DH.20BindheimitePb2Sb2O6O
4.DH.20Monimolite
4.DH.20CuproroméiteCu2Sb2(O,OH)7
4.DH.20StetefeldtiteAg2Sb2(O,OH)7
4.DH.20Stibiconite(Sb,O,OH) ?
4.DH.25RosiaitePbSb25+O6
4.DH.30ZirconoliteCaZrTi2O7
4.DH.35LiandratiteU(Nb,Ta)2O8
4.DH.35PetscheckiteUFe(Nb,Ta)2O8
4.DH.40IngersoniteCa3Mn2+Sb45+O14
4.DH.45PittongiteNa0.22(W,Fe3+)(O,OH)3 · 0.44H2O
18.1.1LithiotantiteLiTa3O8
18.1.2LueshiteNaNbO3
18.1.3NatroniobiteNaNbO3
18.1.4FranconiteNa(Nb2O5)(OH) · 3H2O
18.1.5NatrotantiteNa2Ta4O11
18.1.6IrtyshiteNa2(Ta,Nb)4O11
18.1.7Rankamaite(Na,K)3(Ta,Nb,Al)11(O,OH)31
18.1.8Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)
18.1.9CalciotantiteCaTa4O11
18.1.10RynersoniteCaTa2O6
18.1.11Microlite Group
18.1.12BelyankiniteCa1-2(Ti,Nb)5O12 · 9H2O (?)
18.1.13LatrappiteCa2NbFe3+O6
18.1.14Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2O
18.1.16ParabariomicroliteBaTa4O10(OH)2 · 2H2O
18.1.17Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.1.18AlumotantiteAlTaO4
18.1.19SimpsoniteAl4(Ta,Nb)3O13(OH,F)
18.1.20Sosedkoite(K,Na)5Al2(Ta,Nb)22O60
18.1.21Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6
18.1.22Stannomicrolite (of Hogarth 1977)
18.1.23FoorditeSn2+(Nb,Ta)2O6
18.1.24ChangbaiitePbNb2O6
18.1.25Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
18.1.26Plumbomicrolite (of Hogarth 1977)
18.1.27StibiocolumbiteSb(Nb,Ta)O4
18.1.28StibiotantaliteSb(Ta,Nb)O4
18.1.29Natrobistantite
18.1.30Cesplumtantite(Cs,Na)2(Pb,Sb3+)3Ta8O24
18.1.31Stibiomicrolite (of Groat et al.)
18.1.32Cesstibtantite
18.1.34BismutotantaliteBi(Ta,Nb)O4
18.1.35Bismutomicrolite (of Hogarth 1977)
18.1.36Tantalite-(Mn)MnTa2O6
18.1.37Gerasimovskite(Mn,Ca)(Nb,Ti)5O12 · 9H2O
18.1.38Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6
18.1.39Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
18.1.40WodginiteMn2+Sn4+Ta2O8
18.1.41Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
18.1.42Columbite-(Fe)FeNb2O6
18.1.43Tantalite-(Fe)FeTa2O6
18.1.44Columbite
18.1.45Tantalite(Mn,Fe)(Ta,Nb)2O6
18.1.46Tapiolite(Fe,Mn)(Ta,Nb)2O6
18.1.47Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6
18.1.48Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6
18.1.50Strüverite(Ti,Ta,Fe)O2
18.1.51 Staringite(Fe,Mn)x(Ta,Nb)2xSn6-3xO12

Other Names for Bariomicrolite (of Hogarth 1977)

Other Information

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 Bariomicrolite (of Hogarth 1977)

Reference List:
van der Veen, A. H. (1963): A study of pyrochlore. Verhandel. Kon. Nederlands Geol. Mijnbouwkundig Genootschap. Geol. Ser. 22, 188 p. - American Mineralogist (1963), 48, 1415 (abstract).

Hogarth, D. D. (1977): Classification and nomenclature of the pyrochlore group. American Mineralogist 62, 403-410, esp. 406-407.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 41.

Christy, A.G., Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.

Internet Links for Bariomicrolite (of Hogarth 1977)

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https://www.mindat.org/min-526.html
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Localities for Bariomicrolite (of Hogarth 1977)

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Brazil (FRL)
 
  • Minas Gerais
    • São João del Rei pegmatite province
      • Nazareno
Am Min 62 (1977), 403
Mineral and/or Locality  
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