Pseudograndreefite Mineral Data

General Pseudograndreefite Information

Chemical Formula:

Pb6SO4F1O

Composition:

Molecular Weight = 1,529.25 gm

Lead 81.29 % Pb 87.57 % PbO

Sulfur 2.10 % S 5.24 % SO₃

Oxygen 4.18 % O

Fluorine 12.42 % F 12.42 % F

- % F -5.23 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₆(SO₄)F₁₀

Environment:

Vug isolated from acidic sulfate-rich solutions in the oxidized zone of a low-temperature Pb-Cu-Ag deposit.

IMA Status:

Approved IMA 1989

Locality:

Grand Reef mine, about six km northeast of Klondyke, Aravaipa district, Graham Co., Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for false, and its relation to grandreefite.

Name Pronunciation:

Pseudograndreefite + Pronunciation

Pseudograndreefite Crystallography

Axial Ratios:

a:b:c =0.4351:1:0.4338

Cell Dimensions:

a = 8.5182, b = 19.5736, c = 8.4926, Z = 4; V = 1,415.99 Den(Calc)= 7.17

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: F 222

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

By Intensity(I/I_o): 3.204(1), 1.779(0.7), 2.999(0.3),

Physical Properties of Pseudograndreefite

Cleavage:

None

Color:

Colorless.

Density:

Diaphaneity:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Subadamantine

Streak:

white

Optical Properties of Pseudograndreefite

Gladstone-Dale:

CI meas= 0.058 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.081 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.121,KPDmeas= 0.1239,KC= 0.1316
Ncalc = 1.92 - 1.94

Optical Data:

Biaxial (+), a=1.864, b=1.865, g=1.873, bire=0.0090, 2V(Calc)=40, 2V(Meas)=30.

Calculated Properties of Pseudograndreefite

Electron Density:

Bulk Density (Electron Density)=5.77 gm/cc
note: Specific Gravity of Pseudograndreefite =7.00 gm/cc.

Fermion Index:

Fermion Index = 0.17
Boson Index = 0.83

Photoelectric:

PE_{Pseudograndreefite}=1,514.84 barns/electron
U=PE_{Pseudograndreefite} x rElectron Density=8,736.93 barns/cc.

Radioactivity:

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

Pseudograndreefite Classification

Dana Class:

12.01.03.01 (12)Compound Halides

(12.01)with miscellaneous anions

(12.01.03)Dana Group

12.01.03.01 Pseudograndreefite Pb6SO4F1O F 222 2 2 2

Strunz Class:

07.BD.65 07 - SULFATES (SELENATES, TELLURATES)

07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O

07.BD -With only large cations

07.BD.65 Pseudograndreefite Pb6SO4F1O F 222 2 2 2

Other Pseudograndreefite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.74,p927-933,1989) OPTIC PROP.(Am.Min.,Vol.74,p927-933,1989)

See Also:

Links to other databases for Pseudograndreefite :
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 Pseudograndreefite Specimen Label here :

Pseudograndreefite

Pb6SO4F1O
Dana No: 12.01.03.01 Strunz No: 07.BD.65
Locality:

Notes:

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