Shannonite
A valid IMA mineral species
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About Shannonite
David Shannon
Formula:
Pb2O(CO3)
Colour:
White
Lustre:
Waxy
Hardness:
3 - 3½
Specific Gravity:
7.46 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of David Shannon (18 December 1942, Moline, Illinois, USA - 2 January 2004, Mesa, Arizona, USA), prolific Arizona mineral collector and dealer. He helped collect the first specimens of the mineral.
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).
Chemically related to grootfonteinite and UM1995-03-CO:Pb.
Chemically related to grootfonteinite and UM1995-03-CO:Pb.
Unique Identifiers
Mindat ID:
3632
Long-form identifier:
mindat:1:1:3632:6
GUID
(UUID V4):
(UUID V4):
188b83ff-89dd-41e5-a39b-e7ba214fcd6f
IMA Classification of Shannonite
Approved
Type description reference:
Classification of Shannonite
5.BE.05
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
E : With Pb, Bi
5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
E : With Pb, Bi
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Snn | 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 Shannonite
Waxy
Transparency:
Opaque
Colour:
White
Streak:
White
Hardness:
3 - 3½ on Mohs scale
Tenacity:
Brittle
Fracture:
Irregular/Uneven
Density:
7.46(15) g/cm3 (Calculated)
Optical Data of Shannonite
Type:
Biaxial (+)
RI values:
nα = 1.642 nβ = 1.645 nγ = 1.654
2V:
Measured: 52° , Calculated: 62°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively weak
Colour in reflected light:
white
Chemistry of Shannonite
Mindat Formula:
Pb2O(CO3)
Elements listed:
Crystallography of Shannonite
Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
P21 21 21
Cell Parameters:
a = 9.014(1) Å, b = 9.315(1) Å, c = 5.1465(7) Å
Ratio:
a:b:c = 0.968 : 1 : 0.552
Unit Cell V:
432.13 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0014550 | Shannonite | Krivovichev S V, Burns P C (2000) Crystal chemistry of basic lead carbonates. I. Crystal structure of synthetic shannonite, Pb2O(CO3) Mineralogical Magazine 64 1063-1068 |  | 2000 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.215 Å | (100) |
| 3.181 Å | (90) |
| 4.02 Å | (40) |
| 2.858 Å | (40) |
| 2.564 Å | (35) |
| 6.49 Å | (30) |
| 4.14 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Shannonite
Place of Conservation of Type Material:
Canadian Geological Survey, Ottawa, Canada, 67216; The Natural History Museum, London, England, 1993,487.
Associated Minerals at Type Locality:
Reference:
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.
Synonyms of Shannonite
Other Language Names for Shannonite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 5.BE.X | Abellaite | NaPb2(CO3)2(OH) |
| 5.BE.10 | Hydrocerussite | Pb3(CO3)2(OH)2 |
| 5.BE.15 | Plumbonacrite | Pb5O(OH)2(CO3)3 |
| 5.BE.20 | Phosgenite | Pb2CO3Cl2 |
| 5.BE.25 | Bismutite | (BiO)2CO3 |
| 5.BE.30 | Kettnerite | CaBiCO3OF |
| 5.BE.35 | Beyerite | Ca(BiO)2(CO3)2 |
| 5.BE.40 | Grootfonteinite | Pb3O(CO3)2 |
| 5.BE.45 | Somersetite | Pb8O2(OH)2(CO3)5 |
Other Information
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 Shannonite
mindat.org URL:
https://www.mindat.org/min-3632.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
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 (395) 305-310 doi:10.1180/minmag.1995.059.395.14
Jambor, John L., Pertsev, Nikolai N., Roberts, Andrew C. (1996) New mineral names. American Mineralogist, 81. 249-254
Localities for Shannonite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| Birch et al. (1997) |
France | |
| U. Kolitsch (1997) |
Germany | |
| 50. (in German) +1 other reference |
Greece | |
| [MinMax website] +2 other references |
| LAPIS 24 (7/8) +1 other reference |
| Rieck et al. (2018) |
USA (TL) | |
| Roberts et al. (1995) |
| Grant et al. (2005) |
| Grant et al. (2005) |
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Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia