IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Hydrokenomicrolite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About HydrokenomicroliteHide

Formula:
(◻,H2O)2Ta2(O,OH)6(H2O)
Colour:
Pinkish brown
Lustre:
Adamantine, Resinous
Hardness:
5
Specific Gravity:
6.666 (Calculated)
Crystal System:
Isometric
Two polytypes are known: Hydrokenomicrolite-3C (described as Hydrokenomicrolite ((Andrade et al. 2013), TL = Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil) and Hydrokenomicrolite-3R (formerly described as parabariomicrolite (Ercit et al. 1986), TL = Alto do Giz pegmatite, Equador Co., Rio Grande do Norte, Brazil).


Classification of HydrokenomicroliteHide

Approved
Approval Year:
2011

Physical Properties of HydrokenomicroliteHide

Adamantine, Resinous
Transparency:
Translucent
Colour:
Pinkish brown
Streak:
White
Hardness:
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
6.666 g/cm3 (Calculated)

Optical Data of HydrokenomicroliteHide

Type:
Isotropic
Type:
Isotropic

Chemical Properties of HydrokenomicroliteHide

Formula:
(◻,H2O)2Ta2(O,OH)6(H2O)
Idealised Formula:
2Ta2(H2O)

Crystallography of HydrokenomicroliteHide

Polytype:
Formula:
Crystal System:
Class (H-M)
Space Group:
Space Group Setting:
Cell Parameters:
Ratio:
Unit Cell Volume (calc):
Z:
Hydrokenomicrolite-3C Hydrokenomicrolite-3R
(◻,H2O)2Ta2(O,OH)6(H2O)2Ta2[O,(OH)]6(H2O)
Isometric Trigonal 
m3m (4/m 3 2/m) - Hexoctahedral3m (3 2/m) - Hexagonal Scalenohedral
 R3m
 R3m
a = 10.454(1) Å
a = 7.4290(6) Å, c = 18.505(2) Å
a:c = 1 : 2.491
V 1,142.48 ų
(Calculated from Unit Cell)
V 884.46 ų
(Calculated from Unit Cell)
  

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.112(86)
3.191(52)
3.052(100)
2.642(28)
2.035(11)
1.869(29)
1.788(10)
1.594(24)

Type Occurrence of HydrokenomicroliteHide

General Appearance of Type Material:
Euhedral octahedral crystals 0.2 to 1.5 mm in size.
Place of Conservation of Type Material:
Museu de Geociências, Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil, registration number DR725.
Associated Minerals at Type Locality:

Synonyms of HydrokenomicroliteHide

Relationship of Hydrokenomicrolite 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
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 HydrokenomicroliteHide

Non-fluorescent under ultraviolet light

Other InformationHide

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 HydrokenomicroliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ercit, T.S., Hawthorne, F.C., and Cerný, P. (1986) Parabariomicrolite, a new species, and its structural relationship to the pyrochlore group. The Canadian Mineralogist: 24: 655-663 [as parabariomicrolite].
Andrade, M.B., Atencio, D., Chukanov, N.V., and Ellena, J. (2012) Hydrokenomicrolite, IMA 2011-103. CNMNC Newsletter No. 13, June 2012, page 809; Mineralogical Magazine: 76: 807-817.
Andrade, M.B., Atencio, D., Chukanov, N.V., and Ellena, J. (2013) Hydrokenomicrolite, (☐,H2O)2Ta2(O,OH)6(H2O), a new microlite group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. American Mineralogist: 98: 292–296.
Christy, A.G. and Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.
Atencio, D. (2016) Parabariomicrolite discredited as identical to hydrokenomicrolite-3R. Mineralogical Magazine: 80: 923-924.

Internet Links for HydrokenomicroliteHide

Localities for HydrokenomicroliteHide

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
    • Nazareno
van der Veen, A. H. (1963): A study of pyrochlore. Verhandelingen van het Koninklijk Nederlands geologisch mijnbouwkundig genootschap, Geologische serie 22: 1-188; Atencio D., Andrade M.B., Christy A.G., Giere R., Kartashov P.M. (2010): The pyrochlore supergroup of minerals: nomenclature. Canadian Mineralogist, 48, 673-698.
Andrade, M.B., Atencio, D., Chukanov, N.V., Ellena, J. (2012) Hydrokenomicrolite, IMA 2011-103. CNMNC Newsletter No. 13, June 2012, page 809; Mineralogical Magazine, 76, 807-817; Andrade, M.B., Atencio, D., Chukanov, N.V., Ellena, J. (2013): Hydrokenomicrolite, (☐,H2O)2Ta2(O,OH)6(H2O), a new microlite group mineral from Volta Grande pegmatite, Nazareno, Minas Gerais, Brazil. American Mineralogist, 98, 292–296
  • Rio Grande do Norte
Beurlen, H., Soares, D. R., Thomas, R., Prado-Borges, L. E., & Castro, C. D. (2005). Mineral chemistry of tantalate species new in the Borborema Pegmatitic Province, Northeast Brazil. Anais da Academia Brasileira de Ciências, 77(1), 169-182.Atencio D., Andrade M.B., Christy A.G., Giere R., Kartashov P.M. (2010): The pyrochlore supergroup of minerals: nomenclature. Canadian Mineralogist, 48, 673-698
      • Equador
[Hydrokenomicrolite-3R] Ercit, T. S., Hawthorne, F. C., Cerný, P. (1986) Parabariomicrolite, a new species, and its structural relationship to the pyrochlore group, The Canadian Mineralogist 24: 655-663; Atencio, D. (2016): Parabariomicrolite discredited as identical to hydrokenomicrolite-3R. Mineralogical Magazine, 80: 923-924.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: November 20, 2018 11:28:43 Page generated: October 1, 2018 13:10:42
Go to top of page