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Girdite Mineral Data

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General Girdite Information

Help on Chemical  Formula: Chemical Formula: Pb3H2(Te++++O3)(Te++++++O6)
Help on Composition: Composition: Molecular Weight = 1,022.81 gm
   Tellurium  24.95 %  Te   31.21 % TeO2
   Hydrogen    0.20 %  H     1.76 % H2O
   Lead       60.77 %  Pb   65.47 % PbO
   Oxygen     14.08 %  O
             ______        ______ 
             100.00 %       98.44 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb3H2(TeO3)(TeO6)
Help on Environment: Environment: Secondary tellurate.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Grand Central mine, Tombstone, Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Richard Gird (1836-1910), mining engineer and assayer, who made the first rich silver assays and helped open up the Tombstone district.
Help on Name Pronunciation: Name Pronunciation: Girdite Say GIRDITE

Girdite Image

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Comments: White chalky crystalline spherical massive girdite in rock.
Location: Grand Central Mine, Tombstone, Cochise County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Girdite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0976:1:1.5334
Help on Cell Dimensions: Cell Dimensions: a = 6.241, b = 5.686, c = 8.719, Z = 1; beta = 91.683° V = 309.27 Den(Calc)= 5.49
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.054(1), 1.765(0.8), 2.842(0.8),

Physical Properties of Girdite

Help on Color: Color: White, Lemon white.
Help on Density: Density: 5.5
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Tough - Difficult to break apart as shown by fibrous minerals and most metals.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Streak: Streak: white

Optical Properties of Girdite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.708 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.711 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2665,KPDmeas= 0.2661,KC= 0.1558
Ncalc = 1.86
Help on Optical Data: Optical Data: Biaxial (-), a=2.44, b=2.47, g=2.48, bire=0.0400, 2V(Calc)=58, 2V(Meas)=70. Dispersion r > v strong.

Calculated Properties of Girdite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.56 gm/cc
note: Specific Gravity of Girdite =5.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.15
Boson Index = 0.85
Help on Photoelectric: Photoelectric: PEGirdite =1,217.60 barns/electron
U=PEGirdite x rElectron Density=5,552.25 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Girdite is Not Radioactive

Girdite Classification

Help on  Dana Class: Dana Class: (33)Selenates and Tellurates
  (33.03)with other anion groups
  (33.03.03)Dana Group Girdite Pb3H2(TeO3)(TeO6) Unk Mono
Help on  Strunz Class: Strunz Class: 04.JL.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JL -Tellurites with additional anions, without H2O
04.JL.30 Girdite Pb3H2(TeO3)(TeO6) Unk Mono

Other Girdite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Girdite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.JL.30





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