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Gebhardite

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Tsumeb, Otjikoto (Oshikoto) Region, Namibia
© hamster@aon.at

Show Gebhardite Photos (3)



Formula:
Pb
 
8
(As
 
2
O
 
5
)
 
2
OCl
 
6
System:MonoclinicHardness:3
This page provides mineralogical data about Gebhardite.

Classification of Gebhardite

IMA status:Approved
Strunz 8th edition ID:4/J.06-40
Nickel-Strunz 10th (pending) edition ID:4.JB.50

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
Dana 8th edition ID:46.2.5.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
Hey's CIM Ref.:23.10

23 : Arsenites
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Type Occurrence of Gebhardite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Year of Discovery:1983

Physical Properties of Gebhardite

Hardness (Mohs):3

Crystallography of Gebhardite

Crystal System:Monoclinic
Cell Parameters:a = 6.72Å, b = 11.2Å, c = 34.19Å
β = 85.2°
Ratio:a:b:c = 0.6 : 1 : 3.053
Unit Cell Volume:V 2,564.25 ų (Calculated from Unit Cell)

Optical Data of Gebhardite

Type:Biaxial (-)
RI values: nα = 2.080 nγ = 2.120
Maximum Birefringence:δ = 0.040

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v strong

Chemical Properties of Gebhardite

Formula:
Pb
 
8
(As
 
2
O
 
5
)
 
2
OCl
 
6
Essential elements:As, Cl, O, Pb
All elements listed in formula:As, Cl, O, Pb

Relationship of Gebhardite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JB.05Fetiasite
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
(As
 
2
O
 
5
)O
 
2
4.JB.10Manganarsite
Mn
 
3
(As
 
2
O
 
4
)(OH)
 
4
4.JB.15Magnussonite
Mn
 
10
As
 
6
O
 
18
(OH,Cl)
 
2
4.JB.15UM1984-09-AsO:ClHMn
Mn
 
10
As
 
6
O
 
18
(OH)Cl
4.JB.20Armangite
Mn
2+
26
(AsO
 
3
)
 
14
(HAsO
 
3
)
 
4
(CO
 
3
)
4.JB.25Nanlingite
NaMg
 
4
(AsO
 
3
)
 
2
F
 
4
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
(AsO
 
3
)
 
6
(SiO
 
4
)
 
2
4.JB.35Stenhuggarite
CaFeSb(AsO
 
3
)
 
2
O
4.JB.40Trigonite
Pb
 
3
Mn
2+
 
(AsO
 
3
)
 
2
(HAsO
 
3
)
4.JB.45Finnemanite
Pb
 
5
(AsO
 
3
)
 
3
Cl
4.JB.55Derbylite
Fe
3+
4
Ti
 
3
Sb
3+
 
O
 
13
(OH)
4.JB.55Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.55Graeserite
(Fe
3+
 
,Ti)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.60Hemloite
(Ti,V
3+
 
,Fe
3+
 
,Al)
 
12
(As
3+
 
,Sb
3+
 
)
 
2
O
 
23
(OH)
4.JB.65Freedite
Cu
+
 
Pb
 
8
(AsO
 
3
)
 
2
O
 
3
Cl
 
5
4.JB.70Georgiadèsite
Pb
 
4
(AsO
 
3
)Cl
 
4
(OH)
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(AsO
 
3
)
 
6
(AsO
 
3
,HSiO
 
4
)
 
2
(OH)
 
6
Related Minerals - Hey's Index Grouping:

- +
23.2Nanlingite
NaMg
 
4
(AsO
 
3
)
 
2
F
 
4
23.3Leiteite
Zn(As
 
2
O
 
4
)
23.5Kuznetsovite
(Hg
+
2
)Hg
2+
 
(AsO
 
4
)Cl
23.6Paulmooreite
Pb
 
2
[As
 
2
O
 
5
]
23.7Ecdemite
Pb
 
6
Cl
 
4
(As
 
2
O
 
7
)
23.8Heliophyllite
Pb
 
6
Cl
 
4
(As
 
2
O
 
7
)
23.9Finnemanite
Pb
 
5
(AsO
 
3
)
 
3
Cl
23.11Zimbabweite
(Na,K)
 
2
PbAs
 
4
(Ta,Nb,Ti)
 
4
O
 
18
23.13Rouseite
Pb
 
2
Mn
2+
 
[AsO
 
3
]
 
2
 · 2H
 
2
O
23.14Freedite
Cu
+
 
Pb
 
8
(AsO
 
3
)
 
2
O
 
3
Cl
 
5
23.15Manganarsite
Mn
 
3
(As
 
2
O
 
4
)(OH)
 
4
23.17Armangite
Mn
2+
26
(AsO
 
3
)
 
14
(HAsO
 
3
)
 
4
(CO
 
3
)
23.18Karibibite
Fe
 
2
As
 
4
O
 
9
23.19Schneiderhöhnite
Fe
2+
 
Fe
3+
3
[As
 
5
O
 
13
]
23.20Lazarenkoite
(Ca,Fe)FeAs
 
3
O
 
7
 · 3H
 
2
O
23.21Stenhuggarite
CaFeSb(AsO
 
3
)
 
2
O
23.22Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
(OH)

Other Names for Gebhardite

Synonyms:
IMA1979-071
Other Languages:
German:Gebhardit
Russian:Гебхардит
Spanish:Gebhardita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Gebhardite

Reference List:

- +
American Mineralogist: 70: 215.

Zeitschrift für Kristallographie: 159: 75-76.

Internet Links for Gebhardite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Gebhardite details from Handbook of Mineralogy (PDF)
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    • Localities for Gebhardite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		Neues Jahrb.Min.,Mh.(1983) 445-450
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Jun 2011 14:50:10
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