Girdite Mineral Data

Girdite Mineral Data +

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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.

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:

MonoclinicSpace 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

Diaphaniety:

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

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:

r_electron=4.56 gm/cc
note: r_Girdite=5.50 gm/cc.

Fermion Index

Fermion Index = 0.15431
Boson Index = 0.84569

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Girdite is Not Radioactive

Girdite Classification

Dana Class:

33.3.3.1 (33)Selenates and Tellurates

(33.3)with other anion groups

(33.3.3)Dana Group

33.3.3.1 Girdite Pb3H2(TeO3)(TeO6) Unk Mono

Strunz Class:

IV/K.19-10 IV - Oxides

IV/K - Complex Tellurides with [TeO6]6-, [TeO3]2- and [TeO4]2- groups

IV/K.19 - Girdite - Eztlite series

IV/K.19-10 Girdite Pb3H2(TeO3)(TeO6) Unk Mono

IV/K.19-20 Oboyerite Pb6H6(TeO3)3(TeO6)2·2(H2O) P1 or P1 Tri

IV/K.19-30 Eztlite Pb2Fe6(TeO3)3(TeO6)(OH)10·8(H2O) 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Girdite

Pb3H2(Te++++O3)(Te++++++O6)
Dana No: 33.3.3.1 Strunz No: IV/K.19-10
Locality:

Notes: