Grandreefite Mineral Data

General Grandreefite Information

Chemical Formula:

Pb2SO4F2

Composition:

Molecular Weight = 548.46 gm

Lead 75.56 % Pb 81.39 % PbO

Sulfur 5.85 % S 14.60 % SO₃

Oxygen 11.67 % O

Fluorine 6.93 % F 6.93 % F

- % F -2.92 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂(SO₄)F₂

Environment:

Secondary mineral in isolated vugs in the oxidized portions of a breccia-hosted hydrothermal Cu-Pb-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 for the locality.

Name Pronunciation:

Grandreefite + Pronunciation

Synonym:

ICSD 69697

PDF 45-1455

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Grandreefite Crystallography

Axial Ratios:

a:b:c =1.9511:1:3.2062

Cell Dimensions:

a = 8.667, b = 4.4419, c = 14.242, Z = 4; beta = 107.418° V = 523.15 Den(Calc)= 6.96

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

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

By Intensity(I/I_o): 3.159(1), 3.116(0.9), 3.084(0.8),

Crystal Structure:

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Kampf A R , American Mineralogist , 76 (1991) p.278-282, Grandreefite, Pb2F2SO4: Crystal structure and relationship to the lanthanide, oxide sulfates, Ln2O2SO4

Physical Properties of Grandreefite

Cleavage:

None

Color:

Colorless.

Density:

7.1

Diaphaneity:

Transparent

Hardness:

2.5 - Finger Nail

Luster:

Subadamantine

Streak:

white

Optical Properties of Grandreefite

Gladstone-Dale:

CI meas= 0.097 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.079 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1265,KPDmeas= 0.124,KC= 0.1373
Ncalc = 1.96 - 1.98

Optical Data:

Biaxial (+), a=1.872, b=1.873, g=1.897, bire=0.0250, 2V(Calc)=24, 2V(Meas)=23.

Calculated Properties of Grandreefite

Electron Density:

Bulk Density (Electron Density)=5.84 gm/cc
note: Specific Gravity of Grandreefite =6.96 gm/cc.

Fermion Index:

Fermion Index = 0.16
Boson Index = 0.84

Photoelectric:

PE_Grandreefite=1,383.38 barns/electron
U=PE_Grandreefite x rElectron Density=8,075.36 barns/cc.

Radioactivity:

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

Grandreefite Classification

Dana Class:

12.01.02.01 (12)Compound Halides

(12.01)with miscellaneous anions

(12.01.02)Dana Group

12.01.02.01 Grandreefite Pb2SO4F2 A2/a 2/m

Strunz Class:

07.BD.45 07 - SULFATES (SELENATES, TELLURATES)

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

07.BD -With only large cations

07.BD.45 Grandreefite Pb2SO4F2 A2/a 2/m

Other Grandreefite 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 Grandreefite :
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
15 - WWW-MINCRYST

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

Grandreefite

Pb2SO4F2
Dana No: 12.01.02.01 Strunz No: 07.BD.45
Locality:

Notes: