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
© 2008 Jesse Crawford
|Lustre:||Waxy||Hardness:||3 - 3½|
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
|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
|Hardness (Mohs):||3 - 3½|
Crystallography of Shannonite
|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 Å³ (Calculated from Unit Cell)|
Optical Data of Shannonite
|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.
Chemical Properties of Shannonite
|Essential elements:||C, O, Pb|
|All elements listed in formula:||C, O, Pb|
Relationship of Shannonite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
Other Names for Shannonite
|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
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
Localities for Shannonite
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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