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⇱ Kegginite: Mineral information, data and localities.

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Kegginite

A valid IMA mineral species
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About KegginiteHide

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Formula:
Pb3Ca3[AsV12O40(VO)] · 20H2O
Colour:
Orange-red
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.69 (Calculated)
Crystal System:
Trigonal
Name:
The name kegginite is for the presence of the ε-isomer of the Keggin anion as the basis of the structural unit in the mineral, and recognizes James Fargher Keggin (31 December 1905, Isle of Man, UK - 11 April 1993), Manchester University, who first experimentally determined the structure of α-Keggin anions.
New structure type. Unique combination of elements. Also unique in being the first mineral with vanadyl-containing polyoxometalate anion. First natural Pb arsenovanadate, and the first mineral combining Pb and VO group. One of a few polyoxometalate minerals from the same site; compare, e.g., gatewayite, morrisonite, packratite (also Ca-bearing arsenovanadates).

Structurally related to bicapite.


Unique IdentifiersHide

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Mindat ID:
47606
Long-form identifier:
mindat:1:1:47606:9

IMA Classification of KegginiteHide

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Approved
Approval year:
2016
First published:
2017

Classification of KegginiteHide

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8.FD.10

8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
D : Polyphosphates, etc., with OH and H2O

Mineral SymbolsHide

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

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

Physical Properties of KegginiteHide

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Vitreous
Transparency:
Transparent
Colour:
Orange-red
Streak:
Pinkish-orange
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {001}
Fracture:
Irregular/Uneven
Density:
2.69 g/cm3 (Calculated)

Optical Data of KegginiteHide

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Type:
Uniaxial (-)
Pleochroism:
Visible
Comments:
O orange-red and E red-orange;

Chemistry of KegginiteHide

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Mindat Formula:
Pb3Ca3[AsV12O40(VO)] · 20H2O
Element Weights:
Element% weight
O39.112 %
V26.540 %
Pb24.911 %
Ca4.819 %
As3.003 %
H1.616 %

Calculated from ideal end-member formula.

Crystallography of KegginiteHide

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Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Cell Parameters:
a = 14.936(5) Å, c = 15.846(3) Å
Ratio:
a:c = 1 : 1.061
Unit Cell V:
3,061.39 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Hexagonal tablets

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
M12045KegginiteKampf, Anthony R., Hughes, John M., Nash, Barbara P., Marty, Joe (2017) Kegginite, Pb3Ca3[AsV12O40(VO)]·20H2O, a new mineral with a novel ?-isomer of the Keggin anion. American Mineralogist, 102 (2) 461-4652017Packrat Mine, Colorado, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
15.846 Å(89)
12.935 Å(100)
10.020 Å(43)
4.161 Å(8)
3.499 Å(9)
3.078 Å(9)
2.968 Å(10)
2.917 Å(18)

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]
47e : [Vanadates, chromates, manganates]
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
50 : Coal and/or oil shale minerals<0.36
Stage 10b: Anthropogenic minerals<10 Ka
55 : Anthropogenic mine minerals

Type Occurrence of KegginiteHide

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General Appearance of Type Material:
Orange-red hexagonal tablets
Place of Conservation of Type Material:
Five co-type specimens are deposited in the collections of the Natural History Museum of Los Angeles County, Los Angeles, California, U.S.A., catalog numbers 65636, 65637, 65638, 66474, and 66475
Geological Setting of Type Material:
secondary mineral found on asphaltum in a montroseite-and corvusite-bearing sandstone.
Associated Minerals at Type Locality:

Synonyms of KegginiteHide

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Other Language Names for KegginiteHide

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Dutch:Kegginiet
German:Kegginit

Related Minerals - Strunz-mindat GroupingHide

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8.FD.05VolborthiteCu3(V2O7)(OH)2 · 2H2OMon. 2/m : B2/m
8.FD.05MartyiteZn3(V2O7)(OH)2 · 2H2OTrig. 3m : P3m1
8.FD.05KarpenkoiteCo3(V2O7)(OH)2 · 2H2OTrig. 3m(32/m) : P3m1
8.FD.10VanarsiteNaCa12(As3+V5+8.5V4+3.5As5+6O51)2 · 78H2OMon. 2/m : P21/b
8.FD.10PackratiteCa11(As3+V5+10V4+2As5+6O51)2 · 83H2OTric. 1 : P1
8.FD.10Bicapite[KNa2Mg2(H2O)25][H2PV5+12O40(V5+O)2]Tet. 4/m : I4/m
8.FD.10MorrisoniteCa11(As3+V4+2V5+10As5+6O51)2 · 78H2OMon. 2/m : P21/b
8.FD.10LumsdeniteNaCa3Mg2(As3+V4+2V5+10As5+6O51) · 45H2OTric. 1 : P1
8.FD.10GatewayiteCa6(As3+V4+3 V5+9As5+6O51) · 31H2OMon. 2 : P21
8.FD.15ChinchorroiteNa2Mg5(As2O7)2(AsO3OH)2(H2O)10Tric. 1 : P1

Fluorescence of KegginiteHide

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Not fluorescent

Other InformationHide

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Notes:
Insoluble in H2O and soluble at room temperature in dilute HCl.
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 KegginiteHide

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mindat.org URL:
https://www.mindat.org/min-47606.html
Please feel free to link to this page.

References for KegginiteHide

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Localities for KegginiteHide

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Showing 1 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
USA (TL)
  • Colorado
    • Mesa County
      • Gateway Mining District
        • Beaver Mesa
Kampf et al. (2017)
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