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Shannonite

Big Photo

Tonopah-Belmont Mine (East Vulture Mine; Belmont-McNeil Mine; Economy Mining Co. Mine), Belmont Mountain, Tonopah, Osborn District, Big Horn Mts, Maricopa Co., Arizona, USA
© Maurice de Graaf

Show Shannonite Photos (2)
Formula:
Pb
 
2
[O|CO
 
3
]
System:OrthorhombicColour:White
Lustre:WaxyHardness:3 - 3½
Name:Named after David Shannon, prolific Arizona mineral collector and dealer, and former holder of the Midnight Owl pegmatite mine claim.


A lead oxycarbonate that can form naturally under highly oxidising conditions, but also from heating cerussite (e.g., during fire-setting methods used in ore extraction underground; during mine fires).

Classification of Shannonite

IMA status:Approved
Strunz 8th edition ID:5/C.08-05
Nickel-Strunz 10th (pending) edition ID:5.BE.05

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
E : With Pb, Bi
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Type Occurrence of Shannonite

Type Locality:Grand Reef Mine (Aravaipa Mine; Lead Jewel; Joe Rubal Mine; Vivian Mine; Calistoga Mining & Development Co. Mine; Bringham Silver and Lead Mine), Laurel Canyon, Grand Reef Mountain, Klondyke, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
Year of Discovery:1995

Physical Properties of Shannonite

Lustre:Waxy
Diaphaneity (Transparency):Opaque
Colour:White
Streak:White
Hardness (Mohs):3 - 3½

Crystallography of Shannonite

Crystal System:Orthorhombic
Cell Parameters:a = 9.29Å, b = 9Å, c = 5.13Å
Ratio:a:b:c = 1.032 : 1 : 0.57
Unit Cell Volume:V 428.92 ų (Calculated from Unit Cell)

Optical Data of Shannonite

Type:Biaxial (+)
RI values: nα = 1.642 nβ = 1.645 nγ = 1.654
2V:Measured: 52° , Calculated: 62°
Maximum Birefringence:δ = 0.012

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

Chemical Properties of Shannonite

Formula:
Pb
 
2
[O|CO
 
3
]
Essential elements:C, O, Pb
All elements listed in formula:C, O, Pb

Relationship of Shannonite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.BE.10Hydrocerussite
Pb
 
3
(CO
 
3
)
 
2
(OH)
 
2
5.BE.15Plumbonacrite
Pb
 
5
O(OH)
 
2
(CO
 
3
)
 
3
5.BE.20Phosgenite
Pb
 
2
[Cl
 
2
|CO
 
3
]
5.BE.25Bismutite
(BiO)
 
2
CO
 
3
5.BE.30Kettnerite
(BiO)Ca[F|CO
 
3
]
5.BE.35Beyerite
Ca(BiO)
 
2
(CO
 
3
)
 
2

Other Names for Shannonite

Synonyms:
IMA1993-053
Other Languages:
German:Shannonit
Russian:Шаннонит
Spanish:Shannonita

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 Shannonite

Reference List:Roberts, A. C., Stirling, J. A. R., Carpenter, G. J. C., Criddle, A. J., Jones, G. C., Birkett, T. C. & Birch, W. D. (1995): "Shannonite, Pb2OCO3, a new mineral from the Grand Reef mine, Graham County, Arizona, USA", Mineralogical Magazine: 59: 305-310.

Internet Links for Shannonite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Shannonite in the Natural History Museum (London) online catalogue
  • Shannonite details from Handbook of Mineralogy (PDF)
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    Localities for Shannonite

    Hide Locality List
    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.
    (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.
    Australia
     
    • New South Wales
      • Yancowinna Co.
        • Broken Hill
    		Australian Min. 3:1 (1997)
    France
     
    • Alsace
      • Haut-Rhin
        • Ste Marie-aux-Mines (Markirch)
    		U. Kolitsch (1997): New mineral occurrences from some localities in the Vosges, France: Triembach, Bluttenberg and Val d'Ajol. Aufschluss 48 (2), 65-91. (in German)
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Badenweiler
          • Badenweiler Pb mining District
            • Sehringen
    		Schlomann, C. and Steen, H. (1990) Neue Mineralfunde aus dem Bergbaugebiet von Badenweiler im Südschwarzwald. Lapis, 15 (12), 13-20; 50. (in German)
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
    		[MinMax website]
    USA
     
    • Arizona
      • Graham Co.
        • Aravaipa District
          • Santa Teresa Mts
            • Klondyke
              • Grand Reef Mountain
                • Laurel Canyon
    		Roberts, A.C., J.A.R. Stirling, G.J.C. Carpenter, A.J. Criddle, G.C. Jones, T.C. Birkett, and W.D. Birch (1995) Shannonite, Pb2OCO3, a new mineral from the Grand Reef Mine, Graham County, Arizona, USA. Mineralogical Magazine: 59: 304-310.
      • Maricopa Co.
        • Big Horn Mts
          • Osborn District
            • Tonopah
              • Belmont Mountain
    		Grant, Raymond W., Richard A. Bideaux & Sidney A. Williams (2006), Minerals Added to the Arizona List 1995 to 2005: 8.
      • Pinal Co.
        • Superior District
          • Superior
            • Picketpost Mountain area
    		Grant, Raymond W., Richard A. Bideaux & Sidney A. Williams (2006), Minerals Added to the Arizona List 1995 to 2005: 8.
    Mineral and/or Locality
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