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Girdite

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Formula:
H
 
2
Pb
 
3
(Te
4+
 
O
 
3
)(Te
6+
 
O
 
6
)
System:MonoclinicColour:White
Hardness:2
Name:
For Richard Gird (1836-1910), mining engineer and discoverer of the Tombstone district.
This page provides mineralogical data about Girdite.

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:33.3.3.1
Dana 8th edition ID:33.3.3.1

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

Lustre:Dull
Diaphaneity (Transparency):Transparent, Translucent
Comment:Chalky in aggregates
Colour:White
Hardness (Mohs):2
Tenacity:Brittle
Density (measured):5.5(2) g/cm3
Density (calculated):5.49 g/cm3

Crystallography of Girdite

Crystal System:Monoclinic
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 ų (Calculated from Unit Cell)
Z:1
Morphology:Dense spherules, bow-tie aggregates of tapered prismatic crystals.
Twinning:Complex twins noted.
Comment:Class is questionable

Optical Data of Girdite

Type:Biaxial (-)
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

Formula:
H
 
2
Pb
 
3
(Te
4+
 
O
 
3
)(Te
6+
 
O
 
6
)
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):

- +
4.JL.05Rodalquilarite
Fe
 
2
(TeO
 
2
OH)
 
3
(TeO
 
3
)Cl
4.JL.10Mackayite
Fe
3+
 
(Te
4+
2
O
 
5
)(OH)
4.JL.15Mroseite
CaTe
4+
 
(CO
 
3
)O
 
2
4.JL.20Pingguite
Bi
 
6
Te
4+
2
O
 
13
4.JL.25Tlapallite
H
 
6
(Ca,Pb)
 
2
(Cu,Zn)
 
3
(TeO
 
3
)
 
4
(TeO
 
6
)(SO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
28.4.1Xocomecatlite
Cu
 
3
(TeO
 
4
)(OH)
 
4
28.4.2Carlfriesite
CaTe
4+
2
Te
6+
 
O
 
8
28.4.3Yafsoanite
Ca
 
3
Zn
 
3
(TeO
 
6
)
 
2
28.4.4Tlalocite
Cu
 
10
Zn
 
6
(Te
6+
 
O
 
4
)
 
2
(Te
4+
 
O
 
3
)(OH)
 
25
Cl · 27H
 
2
O
28.4.5Oboyerite
H
 
6
(Pb,Ca)
 
6
(Te
4+
 
O
 
3
)
 
3
(Te
6+
 
O
 
6
)
 
2
· 2H
 
2
O
28.4.6Schieffelinite
Pb
 
8
(TeO
 
4
)
 
5
(SO
 
4
)
 
3
· 8H
 
2
O
28.4.8Khinite
Pb
2+
 
Cu
2+
3
Te
6+
 
O
 
6
(OH)
 
2
28.4.9Parakhinite
Pb
2+
 
Cu
2+
3
Te
6+
 
O
 
6
(OH)
 
2
28.4.10Dugganite
Pb
 
3
Zn
 
3
(AsO
 
4
)
 
2
(TeO
 
6
)
28.4.11Kuksite
Pb
 
3
Zn
 
3
(PO
 
4
)
 
2
(TeO
 
6
)
28.4.12Cheremnykhite
Pb
 
3
Zn
 
3
(VO
 
4
)
 
2
(TeO
 
6
)
28.4.13Tlapallite
H
 
6
(Ca,Pb)
 
2
(Cu,Zn)
 
3
(TeO
 
3
)
 
4
(TeO
 
6
)(SO
 
4
)
28.4.14Montanite
Bi
 
2
(TeO
 
6
) · 2H
 
2
O
28.4.15Kuranakhite
PbMn
4+
 
Te
6+
 
O
 
6
28.4.16Cuzticite
Fe
3+
2
(TeO
 
6
) · 3H
 
2
O
28.4.17Yecoraite
Fe
3+
3
Bi
 
5
(Te
6+
 
O
 
4
)
 
2
(Te
4+
 
O
 
3
)O
 
9
· 9H
 
2
O

Other Names for Girdite

Synonyms:
IMA1979-006
Other Languages:
German:Girdit
Spanish:Girdita

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 Girdite

Reference List:

- +
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

Search Engines:
  • Look for Girdite on Google
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  • External Links:
  • Look for Girdite on Webmineral
  • Look for Girdite on Athena Mineralogy
  • Look for Girdite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Girdite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • rare and unusual minerals mainly crystallized
  • Fine Minerals from Weinrich Minerals, Inc.
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Buy from McDougall Minerals
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  • Search for Girdite on Well-Arranged Molecules
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  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Rare and Unusual minerals at Mineralogical Research Company
  • Buy fine minerals and gemstones from Pala International
  • Find Girdite on www.crystalclassics.co.uk
  • Buy from David K Joyce minerals
  • 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.
    USA
     
    • Arizona
      • Cochise Co.
        • Tombstone Hills
          • Tombstone District
            • Contention-Grand Central Mine group
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 232.
    In the collection of Brent Thorne
    Williams, S. (1980). Schieffelinite, a new lead tellurate-sulphate from Tombstone, Arizona. Mineralogical Magazine, 43(330), 771-773.
    • Nevada
      • Washoe Co.
    NBMG Spec. Pub. 31 Minerals of Nevada
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. 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 thousands 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.
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