Phaunouxite Mineral Data

General Phaunouxite Information

Chemical Formula:

Ca3(AsO4)•11(H2O)

Composition:

Molecular Weight = 596.24 gm

Calcium 20.17 % Ca 28.22 % CaO

Arsenic 25.13 % As 38.55 % As₂O₅

Hydrogen 3.72 % H 33.24 % H₂O

Oxygen 50.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃(AsO₄)₂•11(H₂O)

Environment:

Rare post-mine low-temperature reaction product of carbonate gangue with arsenical solutions

IMA Status:

Approved IMA 1982

Locality:

Gabe-Gottes mine, Rauenthal, near Sainte-Marie-aux-Mines, Haut-Rhin, France. Link to MinDat.org Location Data.

Name Origin:

Named from Phaunoux, the French name for the Rauenthal Valley, France, within which the mineral was first found.

Name Pronunciation:

Phaunouxite + Pronunciation

Synonym:

ICSD 36046

PDF 41-581

Phaunouxite Image

Images:

Phaunouxite

Comments: Aggregate of transparent colorless acicular phaunouxite microcrystals.
Location: Grube Gabe Gottes, Sainte-Marie-aux-Mines, Alsace, Haute-Rhin, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Phaunouxite Crystallography

Axial Ratios:

a:b:c =1.0313:1:0.5093

Cell Dimensions:

a = 12.563, b = 12.181, c = 6.205, Z = 2; alpha = 88.94°, beta = 91.67°, gamma = 113.44° V = 870.67 Den(Calc)= 2.27

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 11.49(1), 3.27(0.9), 6.23(0.9),

Physical Properties of Phaunouxite

Color:

Colorless.

Density:

2.28

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Phaunouxite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2394,KPDmeas= 0.2383,KC= 0.2347
Ncalc = 1.53 - 1.54

Optical Data:

Biaxial (+), a=1.532, b=1.542, g=1.556, bire=0.0240, 2V(Calc)=82, 2V(Meas)=80.

Calculated Properties of Phaunouxite

Electron Density:

Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Phaunouxite =2.28 gm/cc.

Fermion Index:

Fermion Index = 0.0005225352
Boson Index = 0.9994774648

Photoelectric:

PE_Phaunouxite= 18.75 barns/electron
U=PE_Phaunouxite x rElectron Density= 43.01 barns/cc.

Radioactivity:

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

Phaunouxite Classification

Dana Class:

40.03.12.01 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 ï¿½ x(H2O)

(40.03.12)Dana Group

40.03.12.01 Phaunouxite Ca3(AsO4)•11(H2O) P1 1

40.03.12.02 Cattiite! Mg3(PO4)2•22(H2O) P1 1

Strunz Class:

08.CJ.40 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.40 Phaunouxite Ca3(AsO4)•11(H2O) P1 1

08.CJ.40 Rauenthalite Ca3(AsO4)2•10(H2O) P1 1

Other Phaunouxite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Phaunouxite :
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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Phaunouxite

Ca3(AsO4)•11(H2O)
Dana No: 40.03.12.01 Strunz No: 08.CJ.40
Locality:

Notes:

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