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"The powder X-ray diffraction pattern of ottoite is very similar to that reported for girdite. Examination of girdite type material suggests that its description was based upon data obtained from at least two and possibly three different phases, one of which may correspond to ottoite." (Kampf et al., 2010).
Classification of Girdite
|IMA status:||Approved 1979|
|Strunz 8th edition ID:||4/K.19-10|
|Nickel-Strunz 10th (pending) edition ID:||4.JL.30|
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
L : Tellurites with additional anions, without H2O
|Dana 7th edition ID:||184.108.40.206|
|Dana 8th edition ID:||220.127.116.11|
33 : SELENATES AND TELLURATES
3 : Compound Selenates and Tellurates
|Hey's CIM Ref.:||28.4.7|
28 : Selenites, Selenates, Tellurites, and Tellurates
4 : Tellurates
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Type Occurrence of Girdite
|Type Locality:||Joe Mine (Joe shaft), Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA|
|Place of Conservation of Type Material:||Natural History Museum, London 1980,539|
|Year of Discovery:||1979|
|Geological Setting of type material:||Fracture coating in oxidized tellurite and tellurate ores.|
Physical Properties of Girdite
|Diaphaneity (Transparency):||Transparent, Translucent|
|Comment:||Chalky in aggregates|
|Density (measured):||5.5(2) g/cm3|
|Density (calculated):||5.49 g/cm3|
Crystallography of Girdite
|Class (H-M):||m - Domatic|
|Cell Parameters:||a = 6.241Å, b = 5.686Å, c = 8.719Å|
β = 91.68°
|Ratio:||a:b:c = 1.098 : 1 : 1.533|
|Unit Cell Volume:||V 309.27 Å³ (Calculated from Unit Cell)|
|Morphology:||Dense spherules, bow-tie aggregates of tapered prismatic crystals.|
|Twinning:||Complex twins noted.|
|Comment:||Class is questionable|
Optical Data of Girdite
|RI values:||nα = 2.440 nβ = 2.470 nγ = 2.480|
|2V:||Measured: 70° , Calculated: 58°|
|Maximum Birefringence:||δ = 0.040|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
|Dispersion:||r > v strong|
Chemical Properties of Girdite
|Simplified for copy/paste:||H2Pb3(Te4+O3)(Te6+O6)|
|Essential elements:||H, O, Pb, Te|
|All elements listed in formula:||H, O, Pb, Te|
Relationship of Girdite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Girdite
|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 Girdite
Williams, S.A. (1979): Girdite, oboyerite, fairbankite, and winstanleyite, four new tellurium minerals from Tombstone, AZ. Mineralogical Magazine: 43, 453-457.
American Mineralogist: 65: 809.
Internet Links for Girdite
Localities for Girdite
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.
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