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Kegginite

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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 - 11 Apr 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 polyoxometalte from the same site; compare, e.g., gatewayite, morrisonite, packratite (also Ca-bearing arsenovanadates).

Structurally related to bicapite.


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Classification of KegginiteHide

Approved
Approval Year:
2016
First Published:
2017

Physical Properties of KegginiteHide

Vitreous
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

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

Chemical Properties of KegginiteHide

Formula:
Pb3Ca3[AsV12O40(VO)]·20H2O
IMA Formula:
Pb3Ca3[AsV12O40(VO)] · 20H2O

Crystallography of KegginiteHide

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

X-Ray Powder DiffractionHide

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

Type Occurrence of KegginiteHide

Geological Setting of Type Material:
secondary mineral found on asphaltum in a montroseite-and corvusite-bearing sandstone.
Associated Minerals at Type Locality:
Reference:
Kampf, A. R., Hughes, J. M., Nash, B. P., & Marty, J. (2017) Kegginite, Pb3Ca3 [AsV12O40 (VO)]· 20H2O, a new mineral with a novel ε-isomer of the Keggin anion. American Mineralogist: 102(2): 461-465.

Synonyms of KegginiteHide

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 KegginiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Nash, B.P., Marty, J., Hughes, J.M. (2016) Kegginite, IMA 2015-114. CNMNC Newsletter No. 30, April 2016, page 411; Mineralogical Magazine: 80: 407–413
Kampf, A. R., Hughes, J. M., Nash, B. P., and Marty, J. (2017) Kegginite, Pb3Ca3 [AsV12O40 (VO)]· 20H2O, a new mineral with a novel ε-isomer of the Keggin anion. American Mineralogist: 102(2): 461-465.

Internet Links for KegginiteHide

Localities for KegginiteHide

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.
USA (TL)
 
  • Colorado
    • Mesa Co.
      • Gateway
Kampf, A. R., Hughes, J. M., Nash, B. P., and Marty, J. (2017) Kegginite, Pb3Ca3 [AsV12O40 (VO)]· 20H2O, a new mineral with a novel ε-isomer of the Keggin anion. American Mineralogist: 102(2): 461-465.
 
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