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Kegginite

Collectors Summary

Color orange-rot
Streak color rosa-orange
Lustre Glasglanz
Hardness (Mohs) 2
Cleavages gut {001}
Crystal System trigonal, P3
Morphology hexagonale Plättchen

Additional information / Summary

Kegginit ist ein Sekundärmineral welches auf Asphalt in einem Montroseit- und Corvusit-haltigen Sandsten gefunden wurde. Andere Sekundärmineralien als Begleiter sind Ansermetit, Gyps, Mesait und Sherwoodit.

Kegginit vereint eine bisher einmalige Kombination von Elementen.

Chemism

Chemical formula

Pb3Ca3[AsV12O40(VO)]·20H2O

Empirical formula (analysis)

Pb2.98Ca2.39Mg0.56V13.05As0.95O61H40.15

Chemical composition

Arsen, Blei, Calcium, Sauerstoff, Vanadium, Wasserstoff

Unit weight: 2479.28053905 u; Number of atoms in the formula: 121.08

Info

Empirical formula:

Pb2.98Ca2.39Mg0.56V13.05As0.95O61H40.15

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.63

40.15

33.16

1.0079470

40.4690721

Oxygen

O

39.36

61

50.38

15.9994300

975.9652300

Magnesium

Mg

0.55

0.56

0.46

24.3050600

13.6108336

Calcium

Ca

3.86

2.39

1.97

40.0784000

95.7873760

Vanadium

V

26.81

13.05

10.78

50.9415100

664.7867055

Arsenic

As

2.87

0.95

0.78

74.9216020

71.1755219

Lead

Pb

24.91

2.98

2.46

207.2100000

617.4858000

Analysis wt%

PbO : 26.83, CaO : 6.74, V2O5 : 47.38, As2O5 : 4.61, H2O : 14.44, Total : 100 wt%

Strunz 9th edition incl. updates

8

8: Phosphate, Arsenate, Vanadate
8:
8:

Lapis Classification

IV/G.14-010

IV: OXIDE
G: Vanadiumoxide (Polyvanadate mit V4+/5+)

IMA status

anerkannt März 2016 - CNMNC Newsletter No. 30, April 2016

Mineral status

anerkanntes Mineral

Optical Properties

Color

orange-rot

Streak color

rosa-orange

Lustre

Glasglanz

2V angle

Uniaxial (-)

Pleochroism

O orange-rot und E rot-orange; E < O

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

143

Space Group

P3

Cell parameters a (Å)

14.936(5)

Cell parameters b (Å)

-

Cell parameters c (Å)

15.846(3)

Cell parameters a/b or c/a

1.061

Cell parameters c/b

-

Z

2

Volume (ų)

3061.392

Crystal structure

Neuer Strukturtyp; Struktur bestimmt

X-Ray Powder Diffraction

15.846(89),
12.935(100),
10.020(43),
4.161(8),
3.499(9),
3.078(9),
2.968(10),
2.917(18)

XRD chart Kegginite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

hexagonale Plättchen

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

2

Density (g/cm³)

2.69 (berechnet)

2.689 ( ρ calc. Mineralienatlas )

Cleavages

gut {001}

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

USA/Colorado/Mesa Co./Gateway Mining District/Packrat Mine

Type material

Cotype Material lagert in der mineraloischen Sammlung des Natural History Museum of Los Angeles County, Los Angeles, California, USA

Collection number of type material

65636, 65637 und 65638

Paragenesis of type material

Ansermetit, Gyps, Mesait und Sherwoodit

Preface

Rareness

sehr selten

Author (Name, Year)

Anthony R. Kampf, Barbara P. Nash, Joe Marty and John M. Hughe (2016)

References

Kampf, A.R., Nash, B.P., Marty, J. and Hughes, J.M. (2016) Kegginite, IMA 2015-114. CNMNC Newsletter No. 30, April 2016, page 411; Mineralogical Magazine, 80, 407-413.

Anthony R. Kampf, John M. Hughes, Barbara P. Nash, and Joe Marty - Kegginite, Pb3Ca3[AsV12O40(VO)]·20H2O, a new mineral with a novel ε-isomer of the Keggin anion - American Mineralogist - Preprint 30. Sept. 2016 in press.

Other languages

German

Kegginit

English

Kegginite

Russian

Кеггинит

CNMNC (IMA)-Number

IMA 2015-114

CNMNC symbol

Symbol

Kgn

Locations with GPS information

IDs

GUSID (Global unique identifier short form) kqEbw8gnq0OuHTxRrhI14A
GUID (Global unique identifier) C31BA192-27C8-43AB-AE1D-3C51AE1235E0
Database ID 8106