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Girdite

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Richard Gird
Formula:
H2Pb3(Te4+O3)(Te6+O6)
System:
Monoclinic
Colour:
White
Hardness:
2
Name:
For Richard Gird (1836-1910), mining engineer and discoverer of the Tombstone district.
"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

Approved 1979
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 ed.:
33.3.3.1
33.3.3.1

33 : SELENATES AND TELLURATES
3 : Compound Selenates and Tellurates
28.4.7

28 : Selenites, Selenates, Tellurites, and Tellurates
4 : Tellurates
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First Recorded Occurrence of Girdite

Place of Conservation of First Recorded Material:
Natural History Museum, London 1980,539
Year of Discovery:
1979
Geological Setting of First Recorded Material:
Fracture coating in oxidized tellurite and tellurate ores.

Physical Properties of Girdite

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

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°
Max Birefringence:
δ = 0.040
Image 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:
H2Pb3(Te4+O3)(Te6+O6)
Essential elements:
All elements listed in formula:

Relationship of Girdite to other Species

4.JL.05RodalquilariteFe2(TeO2OH)3(TeO3)Cl
4.JL.10MackayiteFe3+(Te24+O5)(OH)
4.JL.15MroseiteCaTe4+(CO3)O2
4.JL.20PingguiteBi6Te24+O13
4.JL.25TlapalliteH6(Ca,Pb)2(Cu,Zn)3(TeO3)4(TeO6)(SO4)
28.4.1XocomecatliteCu3(TeO4)(OH)4
28.4.2CarlfriesiteCaTe24+Te6+O8
28.4.3YafsoaniteCa3Zn3(TeO6)2
28.4.4TlalociteCu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2O
28.4.5OboyeriteH6(Pb,Ca)6(Te4+O3)3(Te6+O6)2 · 2H2O
28.4.6SchieffelinitePb8(TeO4)5(SO4)3 · 8H2O
28.4.8KhinitePb2+Cu32+[Te6+O6](OH)2
28.4.9Khinite-3TPb2+Cu32+Te6+O6(OH)2
28.4.10DugganitePb3Zn3(AsO4)2(TeO6)
28.4.11KuksitePb3Zn3(PO4)2(TeO6)
28.4.12CheremnykhitePb3Zn3(VO4)2(TeO6)
28.4.13TlapalliteH6(Ca,Pb)2(Cu,Zn)3(TeO3)4(TeO6)(SO4)
28.4.14MontaniteBi2(TeO6) · 2H2O
28.4.15KuranakhitePbMn4+Te6+O6
28.4.16CuzticiteFe23+(TeO6) · 3H2O
28.4.17YecoraiteFe33+Bi5(Te6+O4)2(Te4+O3)O9 · 9H2O

Other Names for Girdite

Name in Other Languages:
German:Girdit
Spanish:Girdita

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.

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

Localities for Girdite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
Mineral and/or Locality  
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