Girdite Mineral Data

General Girdite Information

Chemical Formula:

Pb3H2(Te++++O3)(Te++++++O6)

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

Empirical Formula:

Pb₃H₂(TeO₃)(TeO₆)

Environment:

Secondary tellurate.

IMA Status:

Approved IMA 1979

Locality:

Grand Central mine, Tombstone, Arizona, USA. Link to MinDat.org Location Data.

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.

Name Pronunciation:

Girdite

Girdite Image

Images:

Girdite

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

Axial Ratios:

a:b:c =1.0976:1:1.5334

Cell Dimensions:

a = 6.241, b = 5.686, c = 8.719, Z = 1; beta = 91.683° V = 309.27 Den(Calc)= 5.49

Crystal System:

Monoclinic Space Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.054(1), 1.765(0.8), 2.842(0.8),

Physical Properties of Girdite

Color:

White, Lemon white.

Density:

5.5

Diaphaneity:

Translucent

Fracture:

Tough - Difficult to break apart as shown by fibrous minerals and most metals.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Streak:

white

Optical Properties of Girdite

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

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

Electron Density:

Bulk Density (Electron Density)=4.56 gm/cc
note: Specific Gravity of Girdite =5.50 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

PE_Girdite=1,217.60 barns/electron
U=PE_Girdite x rElectron Density=5,552.25 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Girdite is Not Radioactive

Girdite Classification

Dana Class:

33.03.03.01 (33)Selenates and Tellurates

(33.03)with other anion groups

(33.03.03)Dana Group

33.03.03.01 Girdite Pb3H2(TeO3)(TeO6) Unk Mono

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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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Print or Cut-and-Paste your Girdite Specimen Label here :

Girdite

Pb3H2(Te++++O3)(Te++++++O6)
Dana No: 33.03.03.01 Strunz No: 04.JL.30
Locality:

Notes:

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