Phaunouxite Mineral Data

Phaunouxite Mineral Data +

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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)

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

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 - PinacoidalH-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

Diaphaniety:

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

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:

r_electron=2.29 gm/cc
note: r_Phaunouxite=2.28 gm/cc.

Fermion Index

Fermion Index = 0.00052
Boson Index = 0.99948

Photoelectric:

PE_Phaunouxite= 18.75 barns/electron
U=PE_Phaunouxite x r_electron= 43.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Phaunouxite is Not Radioactive

Phaunouxite Classification

Dana Class:

40.3.12.1 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.12)Dana Group

40.3.12.1 Phaunouxite Ca3(AsO4)·11(H2O) P1 1

40.3.12.2 Cattiite! Mg3(PO4)2·22(H2O) P1 1

Strunz Class:

VII/C.24-80 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.24 - Haidingerite - Picropharmacolite series

VII/C.24-10 Haidingerite Ca(AsO3OH)·(H2O) Pcnb 2/m 2/m 2/m

VII/C.24-20 Mcnearite NaCa5H4(AsO4)5·4(H2O) P1,P 1 Tri

VII/C.24-30 Irhtemite Ca4Mg(AsO3OH)2(AsO4)2·4(H2O) Unk Mono

VII/C.24-40 Vladimirite Ca5(AsO3OH)2(AsO4)2·5(H2O) P 2₁/c 2/m

VII/C.24-50 Ferrarisite Ca5(AsO3OH)2(AsO4)2·9(H2O) P1 1

VII/C.24-60 Guerinite Ca5(AsO3OH)2(AsO4)2·9(H2O) P 2₁/n 2/m

VII/C.24-70 Rauenthalite Ca3(AsO4)2·10(H2O) P1 1

VII/C.24-80 Phaunouxite Ca3(AsO4)·11(H2O) P1 1

VII/C.24-90 Picropharmacolite Ca4Mg(AsO3OH)2(AsO4)2·11(H2O) P1 1

Other Phaunouxite Information

References:

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 -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 - WWW-MINCRYST 13 -École des Mines de Paris

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Phaunouxite

Ca3(AsO4)·11(H2O)
Dana No: 40.3.12.1 Strunz No: VII/C.24-80
Locality:

Notes: