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Girdite

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About GirditeHide

01337950014946272915709.jpg
Richard Gird
Formula:
H2Pb3(Te4+O3)(Te6+O6)
Colour:
White
Lustre:
Dull
Hardness:
2
Specific Gravity:
5.5
Crystal System:
Monoclinic
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).

Discredited by IMA in 2016 (Proposal 16-G).
Reinvestigation of type material shows that the original description of girdite was based upon data obtained from at least two and possibly three different phases, one corresponding to ottoite and another probably corresponding to oboyerite, although the latter itself appears to be a mixture (Kampf et al., 2017).


Classification of GirditeHide

Discredited
Approval Year:
1979
Approval History:
Discredited in 2016 (Proposal 16-G): The original description of girdite was based on data obtained from at least two and probably more different phases, among which are oboyerite and ottoite (Kampf et al., 2017).
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

Physical Properties of GirditeHide

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

Optical Data of GirditeHide

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 GirditeHide

Formula:
H2Pb3(Te4+O3)(Te6+O6)

Crystallography of GirditeHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Cell Parameters:
a = 6.241 Å, b = 5.686 Å, c = 8.719 Å
β = 91.68°
Ratio:
a:b:c = 1.098 : 1 : 1.533
Unit Cell 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

First Recorded Occurrence of GirditeHide

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

Synonyms of GirditeHide

Other Language Names for GirditeHide

German:Girdit
Spanish:Girdita

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Girdite associated with ChlorargyriteAgCl
2 photos of Girdite associated with SchieffelinitePb10Te6+6O20(OH)14(SO4)(H2O)5
1 photo of Girdite associated with RodalquilariteFe2(TeO2OH)3(TeO3)Cl
1 photo of Girdite associated with JarositeKFe3+3(SO4)2(OH)6

Related Minerals - Nickel-Strunz GroupingHide

4.JL.05RodalquilariteFe2(TeO2OH)3(TeO3)ClTric. 1 : P1
4.JL.10MackayiteFe3+(Te4+2O5)(OH)Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
4.JL.15MroseiteCaTe4+(CO3)O2Orth. mmm (2/m 2/m 2/m) : Pbca
4.JL.20PingguiteBi6Te4+2O13Orth.
4.JL.25Tlapallite(Ca,Pb)3CaCu6[Te4+3Te6+O12]2(Te4+O3)2(SO4)2·3H2OTrig. 3 2 : P3 2 1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

28.4.1XocomecatliteCu3(TeO4)(OH)4Orth.
28.4.2CarlfriesiteCaTe4+2Te6+O8Mon. 2/m : B2/b
28.4.3YafsoaniteCa3Zn3(TeO6)2Iso. m3 (2/m 3)
28.4.4TlalociteCu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2OOrth.
28.4.5OboyeriteTric.
28.4.6SchieffelinitePb10Te6+6O20(OH)14(SO4)(H2O)5Orth. mmm (2/m 2/m 2/m) : Cmcm
28.4.8KhinitePb2+Cu2+3[Te6+O6](OH)2Orth. mm2 : Fdd2
28.4.9Khinite-3TPb2+Cu2+3Te6+O6(OH)2Trig. 3 : P32
28.4.10DugganitePb3Zn3(AsO4)2(TeO6)Trig. 3 2 : P3 2 1
28.4.11KuksitePb3Zn3(PO4)2(TeO6)Trig. 3 2 : P3 2 1
28.4.12CheremnykhitePb3Zn3(VO4)2(TeO6)Orth.
28.4.13Tlapallite(Ca,Pb)3CaCu6[Te4+3Te6+O12]2(Te4+O3)2(SO4)2·3H2OTrig. 3 2 : P3 2 1
28.4.14MontaniteBi2(TeO6) · 2H2O
28.4.15KuranakhitePbMn4+Te6+O6Orth.
28.4.16CuzticiteFe3+2(TeO6) · 3H2OHex.
28.4.17YecoraiteFe3+3Bi5(Te6+O4)2(Te4+O3)O9 · 9H2O

Other InformationHide

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 GirditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
CNMNC Newsletter No. 32 (Proposal 16-F)
Kampf, A.R., Mills, S.J., Rumsey, M.S. (2017): The discreditation of girdite. Mineralogical Magazine, 81, 1125-1128.

Internet Links for GirditeHide

Localities for GirditeHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China
 
  • Hebei
    • Zhangjiakou
      • Chongli District
        • Shuiquangou Complex
          • Dongping Au-Te ore field
Wang, D., Liu, J., Zhai, D., Carranza, E. J., Wang, Y., Zhen, S., ... & Zhang, F. (2019). Mineral Paragenesis and Ore‐Forming Processes of the Dongping Gold Deposit, Hebei Province, China. Resource Geology, 69(3), 287-313.
USA
 
  • Arizona
    • Cochise County
      • 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.
      • Tombstone Mining District
        • Tombstone
Rolf Luetcke
  • Nevada
    • Washoe Co.
      • Pah Rah Range (Pah Rah Mts)
NBMG Spec. Pub. 31 Minerals of Nevada
 
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