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Kegginite

A valid IMA mineral species

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Kegginite

Mesa County, Colorado, USA

Kegginite

Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA

Kegginite

Mesa County, Colorado, USA

Kegginite

Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA

Kegginite

Mesa County, Colorado, USA

Kegginite

Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA

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About KegginiteHide

James F. Keggin

Formula:

Pb₃Ca₃[AsV₁₂O₄₀(VO)] · 20H₂O

Colour:

Orange-red

Lustre:

Vitreous

Hardness:

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.

Type Locality:

ⓘ Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA

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

Mindat ID:

47606

Long-form identifier:

mindat:1:1:47606:9

IMA Classification of KegginiteHide

IMA status:

Approved

IMA Formula:

Pb²⁺₃Ca₃[As⁵⁺V⁵⁺₁₂O₄₀(V⁵⁺O)]·20H₂O

Approval year:

2016

First published:

2017

Type description reference:

Kampf, Anthony R., Hughes, John M., Nash, Barbara P., Marty, Joe (2017) Kegginite, Pb₃Ca₃[AsV₁₂O₄₀(VO)]·20H₂O, a new mineral with a novel ε-isomer of the Keggin anion. American Mineralogist, 102 (2) 461-465 doi:10.2138/am-2017-5834

Classification of KegginiteHide

Strunz-mindat (2026):

8.FD.10

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

Mineral SymbolsHide

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
Kgn	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 KegginiteHide

Lustre:

Vitreous

Transparency:

Transparent

Colour:

Orange-red

Streak:

Pinkish-orange

Hardness:

2 on Mohs scale

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;

Chemistry of KegginiteHide

Mindat Formula:

Pb₃Ca₃[AsV₁₂O₄₀(VO)] · 20H₂O

Element Weights:

Element	% weight
O	39.112 %
V	26.540 %
Pb	24.911 %
Ca	4.819 %
As	3.003 %
H	1.616 %

Calculated from ideal end-member formula.

Elements listed:

As, Ca, H, O, Pb, V - search for minerals with similar chemistry

Crystallography of KegginiteHide

Crystal System:

Trigonal

Class (H-M):

3 - Pyramidal

Space Group:

Cell Parameters:

a = 14.936(5) Å, c = 15.846(3) Å

Ratio:

a:c = 1 : 1.061

Unit Cell V:

3,061.39 Å³ (Calculated from Unit Cell)

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

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
M12045	Kegginite	Kampf, 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) 461-465		2017	Packrat Mine, Colorado, USA	0	293

CIF Raw Data - click here to close

 
data_kegginite
 
_audit_creation_method            'SHELXL-2014/7'
_shelx_SHELXL_version_number      '2014/7'
_chemical_name_mineral            'kegginite' 
_chemical_compound_source         'Packrat mine, Colorado'
_chemical_formula_sum
 'As Ca2.43 Mg0.57 O60.63 Pb3 V13' 
_chemical_formula_weight          2439.88  
_chemical_formula_analytical          
 'Pb2.98 Ca2.39 Mg0.56 V13.05 As0.95 O61 H40.15' 
 
_space_group_crystal_system       trigonal
_space_group_IT_number            147
_space_group_name_H-M_alt         'P -3'
_space_group_name_Hall            '-P 3'
 
_shelx_space_group_comment
;
The symmetry employed for this shelxl refinement is uniquely defined
by the following loop, which should always be used as a source of
symmetry information in preference to the above space-group names.
They are only intended as comments.
;
 
loop_
 _space_group_symop_operation_xyz
 'x, y, z'
 '-y, x-y, z'
 '-x+y, -x, z'
 '-x, -y, -z'
 'y, -x+y, -z'
 'x-y, x, -z'
 
_cell_length_a                    14.936(5)
_cell_length_b                    14.936(5)
_cell_length_c                    15.846(3)
_cell_angle_alpha                 90
_cell_angle_beta                  90
_cell_angle_gamma                 120
_cell_volume                      3061(2)
_cell_formula_units_Z             2  
_cell_measurement_temperature     293(2)
 
loop_
 _atom_site_label
 _atom_site_type_symbol
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_U_iso_or_equiv
 _atom_site_adp_type
 _atom_site_occupancy
 _atom_site_site_symmetry_order  
 _atom_site_calc_flag
 _atom_site_refinement_flags_posn
 _atom_site_refinement_flags_adp
 _atom_site_refinement_flags_occupancy
 _atom_site_disorder_assembly
 _atom_site_disorder_group
Pb Pb 0.36763(8) 0.42910(8) 0.57446(7) 0.0374(5) Uani 1 1 d . . . . .
Ca1 Ca 0.5844(15) 0.3976(17) 0.8921(10) 0.103(6) Uani 0.43 1 d . . P . .
Mg1 Mg 0.5844(15) 0.3976(17) 0.8921(10) 0.103(6) Uani 0.07 1 d . . P . .
Ca2 Ca 0.6989(15) 0.4760(17) 0.8796(11) 0.103(6) Uani 0.38 1 d . . P . .
Mg2 Mg 0.6989(15) 0.4760(17) 0.8796(11) 0.103(6) Uani 0.12 1 d . . P . .
As As 0.3333 0.6667 0.6602(3) 0.0340(12) Uani 1 3 d S T P . .
V1 V 0.3333 0.6667 0.8772(5) 0.054(2) Uani 1 3 d S T P . .
V2 V 0.4682(3) 0.6884(3) 0.4627(3) 0.0319(12) Uani 1 1 d . . . . .
V3 V 0.5899(3) 0.6958(3) 0.6119(3) 0.0379(13) Uani 1 1 d . . . . .
V4 V 0.2383(4) 0.4258(4) 0.7773(3) 0.0463(14) Uani 1 1 d . . . . .
V5 V 0.0943(4) 0.5254(4) 0.7786(3) 0.0464(14) Uani 1 1 d . . . . .
O1 O 0.3333 0.6667 0.5551(18) 0.035(8) Uani 1 3 d S T P . .
O2 O 0.4487(12) 0.6819(12) 0.6959(10) 0.040(5) Uani 1 1 d . . . . .
O3 O 0.3333 0.6667 0.9806(17) 0.053(9) Uani 1 3 d S T P . .
O4 O 0.3492(13) 0.5615(12) 0.8432(10) 0.041(5) Uani 1 1 d . . . . .
O5 O 0.5468(11) 0.6968(12) 0.3877(10) 0.035(4) Uani 1 1 d . . . . .
O6 O 0.6914(12) 0.7057(13) 0.5686(10) 0.041(5) Uani 1 1 d . . . . .
O7 O 0.2418(14) 0.3418(13) 0.8401(11) 0.053(5) Uani 1 1 d . . . . .
O8 O 0.0034(13) 0.5046(13) 0.8431(11) 0.053(5) Uani 1 1 d . . . . .
O9 O 0.4299(11) 0.7782(11) 0.4235(9) 0.029(4) Uani 1 1 d . . . . .
O10 O 0.5598(11) 0.7826(12) 0.5463(9) 0.032(4) Uani 1 1 d . . . . .
O11 O 0.4871(11) 0.5956(12) 0.5413(9) 0.028(4) Uani 1 1 d . . . . .
O12 O 0.1533(12) 0.3502(12) 0.6935(10) 0.037(4) Uani 1 1 d . . . . .
O13 O 0.0315(12) 0.4373(13) 0.6947(10) 0.044(5) Uani 1 1 d . . . . .
O14 O 0.1427(13) 0.4513(12) 0.8316(11) 0.049(5) Uani 1 1 d . . . . .
O15 O 0.3614(11) 0.4643(13) 0.7171(10) 0.039(5) Uani 1 1 d . . . . .
OW1 O 0.631(2) 0.5270(19) 0.9945(14) 0.099(8) Uani 1 1 d . . . . .
OW2 O 0.6557(18) 0.477(2) 0.7401(13) 0.104(9) Uani 1 1 d . . . . .
OW3 O 0.8714(18) 0.591(2) 0.7953(19) 0.152(15) Uani 1 1 d . . . . .
OW4 O 0.431(3) 0.303(2) 0.9962(16) 0.149(12) Uani 1 1 d . . . . .
OW5 O 0.0000 0.0000 0.766(4) 0.16(2) Uani 1 3 d S T P . .
OW6 O 0.053(4) -0.081(4) 0.675(3) 0.13(3) Uiso 0.55(7) 1 d . . . . .
OW7A O 0.732(4) 0.668(4) 0.857(3) 0.11(3) Uiso 0.53(7) 1 d . . . . .
OW7B O 0.763(7) 0.731(7) 0.771(7) 0.16(6) Uiso 0.36(8) 1 d . . . . .
OW8A O 0.917(6) 0.766(6) 0.598(6) 0.15(5) Uiso 0.44(9) 1 d . . . . .
OW8B O 0.918(5) 0.809(6) 0.527(6) 0.10(4) Uiso 0.33(8) 1 d . . . . .
 
loop_
 _atom_site_aniso_label
 _atom_site_aniso_U_11
 _atom_site_aniso_U_22
 _atom_site_aniso_U_33
 _atom_site_aniso_U_23
 _atom_site_aniso_U_13
 _atom_site_aniso_U_12
Pb 0.0352(8) 0.0320(8) 0.0463(8) 0.0025(5) -0.0009(5) 0.0178(6)
Ca1 0.102(15) 0.18(2) 0.060(11) 0.026(11) 0.007(10) 0.097(15)
Mg1 0.102(15) 0.18(2) 0.060(11) 0.026(11) 0.007(10) 0.097(15)
Ca2 0.100(16) 0.170(19) 0.065(12) 0.011(12) 0.009(10) 0.088(15)
Mg2 0.100(16) 0.170(19) 0.065(12) 0.011(12) 0.009(10) 0.088(15)
As 0.0334(19) 0.0334(19) 0.035(3) 0.000 0.000 0.0167(9)
V1 0.061(4) 0.061(4) 0.039(6) 0.000 0.000 0.0305(19)
V2 0.027(3) 0.031(3) 0.038(3) 0.001(2) 0.000(2) 0.015(2)
V3 0.037(3) 0.037(3) 0.038(3) -0.004(2) -0.008(2) 0.018(2)
V4 0.052(3) 0.051(3) 0.037(3) 0.011(2) 0.002(2) 0.027(3)
V5 0.045(3) 0.056(3) 0.043(3) 0.013(2) 0.016(2) 0.029(3)
O1 0.018(10) 0.018(10) 0.07(2) 0.000 0.000 0.009(5)
O2 0.039(11) 0.041(11) 0.044(12) -0.007(9) -0.011(9) 0.022(10)
O3 0.067(15) 0.067(15) 0.026(19) 0.000 0.000 0.033(7)
O4 0.049(12) 0.037(11) 0.038(12) 0.006(8) 0.008(9) 0.022(10)
O5 0.025(10) 0.038(11) 0.043(11) 0.009(8) 0.019(8) 0.017(9)
O6 0.026(10) 0.059(13) 0.044(11) 0.011(9) -0.004(8) 0.026(10)
O7 0.070(14) 0.049(12) 0.047(12) 0.013(10) 0.009(10) 0.034(11)
O8 0.048(12) 0.048(12) 0.054(13) 0.011(9) 0.015(10) 0.018(10)
O9 0.023(10) 0.030(10) 0.029(10) 0.001(8) -0.005(7) 0.009(8)
O10 0.016(9) 0.037(11) 0.034(11) -0.011(8) -0.011(7) 0.007(8)
O11 0.029(10) 0.040(11) 0.032(10) -0.001(8) -0.003(7) 0.030(9)
O12 0.039(11) 0.028(10) 0.035(11) 0.012(8) 0.001(8) 0.009(9)
O13 0.041(12) 0.052(12) 0.027(11) 0.006(9) 0.003(8) 0.014(10)
O14 0.043(12) 0.032(11) 0.062(13) 0.009(9) 0.017(9) 0.011(10)
O15 0.027(10) 0.050(12) 0.032(11) -0.003(8) -0.009(8) 0.014(9)
OW1 0.14(2) 0.13(2) 0.058(16) -0.004(14) -0.008(14) 0.090(19)
OW2 0.093(18) 0.22(3) 0.044(14) -0.033(16) -0.010(12) 0.11(2)
OW3 0.065(17) 0.23(3) 0.17(3) -0.15(3) -0.030(17) 0.08(2)
OW4 0.24(4) 0.14(3) 0.07(2) 0.007(17) -0.03(2) 0.09(2)
OW5 0.14(3) 0.14(3) 0.20(6) 0.000 0.000 0.068(14)

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
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)

Locality:

Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA

Reference:

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest 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

Type Locality:

ⓘ Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA

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:

Reference:

Synonyms of KegginiteHide

IMA2015-114

Other Language Names for KegginiteHide

Dutch:Kegginiet

German:Kegginit

Related Minerals - Strunz-mindat Grouping Hide

8.FD.05	Volborthite	Cu₃(V₂O₇)(OH)₂ · 2H₂O	Mon. 2/m : B2/m
8.FD.05	Martyite	Zn₃(V₂O₇)(OH)₂ · 2H₂O	Trig. 3m : P3m1
8.FD.05	Karpenkoite	Co₃(V₂O₇)(OH)₂ · 2H₂O	Trig. 3m(32/m) : P3m1
8.FD.10	Vanarsite	NaCa₁₂(As³⁺V⁵⁺_8.5V⁴⁺_3.5As⁵⁺₆O₅₁)₂ · 78H₂O	Mon. 2/m : P2₁/b
8.FD.10	Packratite	Ca₁₁(As³⁺V⁵⁺₁₀V⁴⁺₂As⁵⁺₆O₅₁)₂ · 83H₂O	Tric. 1 : P1
8.FD.10	Bicapite	[KNa₂Mg₂(H₂O)₂₅][H₂PV⁵⁺₁₂O₄₀(V⁵⁺O)₂]	Tet. 4/m : I4/m
8.FD.10	Morrisonite	Ca₁₁(As³⁺V⁴⁺₂V⁵⁺₁₀As⁵⁺₆O₅₁)₂ · 78H₂O	Mon. 2/m : P2₁/b
8.FD.10	Lumsdenite	NaCa₃Mg₂(As³⁺V⁴⁺₂V⁵⁺₁₀As⁵⁺₆O₅₁) · 45H₂O	Tric. 1 : P1
8.FD.10	Gatewayite	Ca₆(As³⁺V⁴⁺₃ V⁵⁺₉As⁵⁺₆O₅₁) · 31H₂O	Mon. 2 : P2₁
8.FD.15	Chinchorroite	Na₂Mg₅(As₂O₇)₂(AsO₃OH)₂(H₂O)₁₀	Tric. 1 : P1

Fluorescence of KegginiteHide

In UV light:

Not fluorescent

Other InformationHide

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

mindat.org URL:

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

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

Buy from D. Joyce minerals

References for KegginiteHide

Reference List:

Hålenius, U., Hatert, F., Pasero, M., Mills, S.J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter no 30. Mineralogical Magazine, 80 (2) 407-413 doi:10.1180/minmag.2016.080.081

(2016)

(2017) Kegginite. Handbook of Mineralogy. Mineralogical Society of America

Localities for KegginiteHide

Showing 1 localities.

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.

Hide all sections | Show all sections

Locality ListHide

- 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). ~~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

ⓘ Packrat Mine (TL)

Kampf et al. (2017)

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Kegginite

About KegginiteHide

Unique IdentifiersHide

IMA Classification of KegginiteHide

Classification of KegginiteHide

Mineral SymbolsHide

Physical Properties of KegginiteHide

Optical Data of KegginiteHide

Chemistry of KegginiteHide

Crystallography of KegginiteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of KegginiteHide

Synonyms of KegginiteHide

Other Language Names for KegginiteHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of KegginiteHide

Other InformationHide

Internet Links for KegginiteHide

References for KegginiteHide

Localities for KegginiteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide