Kenoplumbomicrolite
A valid IMA mineral species
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About Kenoplumbomicrolite
Formula:
(Pb,◻)2Ta2O6(◻,OH,O)
Colour:
Yellowish brown
Lustre:
Greasy
Hardness:
6
Specific Gravity:
7.310 - 7.832
Crystal System:
Isometric
Member of:
Name:
Named according to the pyrochlore supergroup nomenclature (Atencio et al. 2010). Keno is Greek for empty, for the vacant ionic position, plumbo is derived from the Latin for lead, and the microlite part of the name is for the relationship to that mineral group.
Orginally published as a possible new species; published structure determination ( Atencio et al. 2010, Christy et al. 2013). Approved by IMA as a valid, new species in 2016.
Unique Identifiers
Mindat ID:
40357
Long-form identifier:
mindat:1:1:40357:7
IMA Classification of Kenoplumbomicrolite
Approved
IMA Formula:
(Pb,Na,Ca,◻)2Ta2(O,OH)7
Approval year:
2016
Type description reference:
Classification of Kenoplumbomicrolite
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
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 Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Kpmic | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Kenoplumbomicrolite
Greasy
Transparency:
Translucent
Colour:
Yellowish brown
Streak:
White
Hardness:
6 on Mohs scale
Hardness Data:
Measured
Density:
7.310 - 7.832 g/cm3 (Measured)
Comment:
The measurements of density were affected by presence of uraninite inclusions
Optical Data of Kenoplumbomicrolite
Type:
Isotropic
Chemistry of Kenoplumbomicrolite
Mindat Formula:
(Pb,◻)2Ta2O6(◻,OH,O)
Element Weights:
Elements listed:
Chemical Analysis
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | (Pb1.30◻0.30Ca0.29Na0.08U0.03)Σ2.00(Ta0.82Nb0.62Si0.23Sn4+0.15Ti0.07Fe3+0.10Al0.01)Σ2.00O6[◻0.52(OH)0.25O0.23]Σ1.00 |
| 2 | (Pb1.33◻0.66Mn0.01)Σ2.00(Ta0.87Nb0.72Sn4+0.18Fe3+0.11W0.08Ti0.04)Σ2.00O6[◻0.80(OH)0.10O0.10]Σ1.00 |
Sample references:
| ID | Type | Locality | Reference | Notes |
|---|---|---|---|---|
| 1 | Type Specimen | Ploskaya Mountain, Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia | ||
| 2 | Type Specimen | " " |
Crystallography of Kenoplumbomicrolite
Crystal System:
Isometric
Cell Parameters:
a = 10.575(5) Å
Unit Cell V:
1182.6 ų
Z:
3
Morphology:
Octahedral, cuboctahedral crystals, up to 20 cm
Comment:
Spacegroup: Fd-3m
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.050 Å | (100) |
| 2.641 Å | (42) |
| 2.425 Å | (9) |
| 2.033 Å | (6) |
| 1.869 Å | (26) |
| 1.595 Å | (23) |
| 1.527 Å | (9) |
Reference:
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Kenoplumbomicrolite
General Appearance of Type Material:
Yellowish brown octahedral, cuboctahedral and massive crystals, up to 20 cm
Place of Conservation of Type Material:
Mineralogical collections of the Museu de Geociências, Instituto de Geociências, Universidade de São Paulo, Rua do Lago 562, 05508–080 São Paulo, Brazil (registration number DR980)
Empirical Formula of Type Material:
(Pb1.33◻0.66Mn0.01)Σ2.00(Ta0.87Nb0.72Sn4+0.18Fe3+0.11W0.08Ti0.04)Σ2.00O6[◻0.80(OH)0.10O0.10]Σ1.00
Geological Setting of Type Material:
Amazonite pegmatite
Associated Minerals at Type Locality:
Reference:
Synonyms of Kenoplumbomicrolite
Other Language Names for Kenoplumbomicrolite
Dutch:Kenoplumbomicroliet
German:Kenoplumbomikrolith
Relationship of Kenoplumbomicrolite to other Species
Member of:
Other Members of Microlite Group:
| Fluorcalciomicrolite | (Ca,Na)2(Ta,Nb)2O6F | Iso. m3m(4/m32/m) : Fd3m |
| Fluornatromicrolite | (Na1.5Bi0.5)Ta2O6F | Iso. m3m(4/m32/m) : Fd3m |
| Hydrokenomicrolite | (◻,H2O)2Ta2(O,OH)6(H2O) | Iso. m3m(4/m32/m) |
| 'Hydromicrolite' | (H2O,◻)2Ta2(O,OH)6(H2O) | |
| Hydroxycalciomicrolite | Ca1.5Ta2O6(OH) | Iso. 432 : P4232 |
| 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 |
| Oxybismutomicrolite | (Bi1.33◻0.67)Σ2Ta2O6O | Iso. m3m(4/m32/m) : Fd3m |
| Oxycalciomicrolite | Ca2Ta2O6O | Iso. m3m(4/m32/m) : Fd3m |
| Oxystannomicrolite | Sn2Ta2O6O | Iso. m3m(4/m32/m) : Fd3m |
| Oxystibiomicrolite | (Sb3+,Ca)2Ta2O6O | Iso. m3m(4/m32/m) : Fd3m |
| 'Uranmicrolite (of Hogarth 1977)' | (Ca,U,Na)2-x(Ta,Nb)2(O,OH)7 | Iso. |
| 'Yttromicrolite (of Hogarth)' | (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7 | Iso. m3m(4/m32/m) : Fd3m |
Related Minerals - Strunz-mindat Grouping
| 4.DH. | Cesiokenopyrochlore | ◻Nb2(O,OH)6(Cs,◻) |
| 4.DH. | Roméite Group | A2(Sb5+)2O6Z |
| 4.DH. | Oxyplumboroméite | Pb2Sb2O6O |
| 4.DH. | Fluornatropyrochlore | (Na,Pb,Ca,REE,U)2Nb2O6F |
| 4.DH. | Hydroxykenomicrolite | (◻,Na,Sb3+)2Ta2O6(OH,Cs) |
| 4.DH. | 'Fluornatroroméite' | (Na,Ca)2Sb2(O,OH)6F |
| 4.DH. | Oxyyttrobetafite-(Y) | Y2Ti2O6O |
| 4.DH.05 | Thorutite | (Th,U,Ca)Ti2(O,OH)6 |
| 4.DH.05 | Orthobrannerite | U4+U6+Ti4O12(OH)2 |
| 4.DH.05 | Brannerite | UTi2O6 |
| 4.DH.10 | Kassite | CaTi2O4(OH)2 |
| 4.DH.10 | Lucasite-(La) | |
| 4.DH.10 | Lucasite-(Ce) | CeTi2(O,OH)6 |
| 4.DH.15 | 'Fluorhydropyrochlore' | |
| 4.DH.15 | Hydrokenoelsmoreite | ◻2W2O6(H2O) |
| 4.DH.15 | 'Hydroxynatromicrolite' | (Na,Bi3+,◻)2Ta2O6(OH) |
| 4.DH.15 | Hydroplumboelsmoreite | (Pb,◻)(W,Fe3+)2O6 · H2O |
| 4.DH.15 | Hydropyrochlore | (H2O,◻)2Nb2(O,OH)6(H2O) |
| 4.DH.15 | 'Unnamed (Sb-analogue of Hydroxymanganopyrochlor)' | (Mn,Ca,Y)2(Sb,Ti)2O6(OH) |
| 4.DH.15 | Hydroxynatropyrochlore | (Na,Ca,Ce)2Nb2O6(OH) |
| 4.DH.15 | Hydrokenopyrochlore | (◻,x)2Nb2O6(H2O,Cs) |
| 4.DH.15 | Oxybismutomicrolite | (Bi1.33◻0.67)Σ2Ta2O6O |
| 4.DH.15 | Kenomicrolite | ◻2Ta2[O4(OH)2]◻ |
| 4.DH.15 | Fluornatromicrolite | (Na1.5Bi0.5)Ta2O6F |
| 4.DH.15 | 'Oxynatropyrochlore' | (Na,Ca,U)2Nb2O6(O,OH) |
| 4.DH.15 | Hydroxycalciopyrochlore | (Ca,Na,U,◻)2(Nb,Ti)2O6(OH) |
| 4.DH.15 | Fluorcalciopyrochlore | (Ca,Na)2(Nb,Ti)2O6F |
| 4.DH.15 | Oxycalciopyrochlore | Ca2Nb2O6O |
| 4.DH.15 | 'Fluorstrontiopyrochlore' | (Sr,◻)2Nb2(O,OH)6F |
| 4.DH.15 | Oxyplumbopyrochlore | Pb2Nb2O6O |
| 4.DH.15 | 'Fluorplumbopyrochlore' | (Pb,Y,Th,U,Na,Ca)2-x(Nb,Ti)2O6F |
| 4.DH.15 | 'Bismutomicrolite (of Hogarth 1977)' | |
| 4.DH.15 | 'Bismutopyrochlore (of Chukanov et al.)' | (Bi,Ca,U,Pb)2-xNb2(O,OH)6(OH) |
| 4.DH.15 | 'Kenoplumbopyrochlore' | (Pb,◻)Nb2O6(◻,O) |
| 4.DH.15 | Hydroxyplumbopyrochlore | (Pb1.5◻0.5)Nb2O6(OH) |
| 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 | Hydroxycalciomicrolite | Ca1.5Ta2O6(OH) |
| 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) |
| 4.DH.15 | 'Oxycalciobetafite' | Ca2(Ti,Nb)2O6O |
| 4.DH.15 | 'Oxyuranobetafite' | (U,Ca,◻)2(Ti,Nb)2O6O |
| 4.DH.15 | Fluorcalciomicrolite | (Ca,Na)2(Ta,Nb)2O6F |
| 4.DH.15 | Oxycalciomicrolite | Ca2Ta2O6O |
| 4.DH.15 | Oxystannomicrolite | Sn2Ta2O6O |
| 4.DH.15 | Oxynatromicrolite | (Na,Ca,U)2(Ta,Nb)2O6(O,F) |
| 4.DH.15 | Oxystibiomicrolite | (Sb3+,Ca)2Ta2O6O |
| 4.DH.15 | 'Hydromicrolite' | (H2O,◻)2Ta2(O,OH)6(H2O) |
| 4.DH.15 | 'Plumbomicrolite (of Hogarth 1977)' | |
| 4.DH.15 | Hydrokenomicrolite | (◻,H2O)2Ta2(O,OH)6(H2O) |
| 4.DH.15 | Hydroxykenoelsmoreite | (◻,Pb)2(W,Fe3+,Al)2(O,OH)6(OH) |
| 4.DH.15 va | 'Yttromicrolite (of Hogarth)' | (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7 |
| 4.DH.15 | Hydroxykenopyrochlore | (◻,Ce,Ba)2(Nb,Ti)2O6(OH,F) |
| 4.DH.15 | Hydroxymanganopyrochlore | (Mn2+,Th,Na,Ca,REE)2(Nb,Ti)2O6(OH) |
| 4.DH.20 | 'Cuproroméite' | Cu2Sb2(O,OH)7 |
| 4.DH.20 | Hydroxycalcioroméite | (Ca,Sb3+)2(Sb5+,Ti)2O6(OH) |
| 4.DH.20 | Bindheimite | Pb2Sb2O6O |
| 4.DH.20 | Hydroxyferroroméite | (Fe2+1.5◻0.5)Sb5+2O6(OH) |
| 4.DH.20 | Fluorcalcioroméite | (Ca,Na,◻)2Sb5+2(O,OH)6F |
| 4.DH.20 | Oxycalcioroméite | Ca2Sb2O6O |
| 4.DH.20 | Stetefeldtite | Ag2Sb2(O,OH)7 |
| 4.DH.20 | Stibiconite | Sb3+Sb5+2O6(OH) |
| 4.DH.20 | Monimolite | Pb2Sb5+2O7 |
| 4.DH.25 | Rosiaite | PbSb5+2O6 |
| 4.DH.30 | Stefanweissite | (Ca,REE)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14 |
| 4.DH.30 | Zirconolite | CaZrTi2O7 |
| 4.DH.30 | Laachite | (Ca,Mn)2Zr2Nb2TiFeO14 |
| 4.DH.30 | Nöggerathite-(Ce) | (Ce,Ca)2Zr2(Nb,Ti)(Ti,Nb)2Fe2+O14 |
| 4.DH.35 | Liandratite | U(Nb,Ta)2O8 |
| 4.DH.35 | Petscheckite | UFe(Nb,Ta)2O8 |
| 4.DH.40 | Ingersonite | Ca3Mn2+Sb5+4O14 |
| 4.DH.45 | Pittongite | Na0.22(W,Fe3+)(O,OH)3 · 0.44H2O |
| 4.DH.50 | Tazzoliite | Ba4-xNaxTi2Nb3SiO17[PO2(OH)2]x(OH)(1-2x) |
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.
Internet Links for Kenoplumbomicrolite
mindat.org URL:
https://www.mindat.org/min-40357.html
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References for Kenoplumbomicrolite
Reference List:
Atencio, D., Andrade, M. B., Christy, A. G., Giere, R., Kartashov, P. M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist, 48 (3) 673-698 doi:10.3749/canmin.48.3.673
Christy, A. G., Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine, 77 (1) 13-20 doi:10.1180/minmag.2013.077.1.02
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter No. 33. Mineralogical Magazine, 80 (6) 1135-1144 doi:10.1180/minmag.2016.080.085
Localities for Kenoplumbomicrolite
Showing 2 localities.
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The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| Stepanov V.I. et al. (1982) +3 other references |
USA | |
| Duresky et al. (2025) |
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Ploskaya Mountain, Western Keivy Massif, Keivy Mountains, Lovozersky District, Murmansk Oblast, Russia