Rauenthalite Mineral Data

General Rauenthalite Information

Chemical Formula:

Ca3(AsO4)2•10(H2O)

Composition:

Molecular Weight = 578.23 gm

Calcium 20.79 % Ca 29.09 % CaO

Arsenic 25.91 % As 39.75 % As₂O₅

Hydrogen 3.49 % H 31.16 % H₂O

Oxygen 49.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃(AsO₄)₂•10(H₂O)

Environment:

Post-mine low-temperature reaction product of carbonate gangue with arsenical solutions derived from arsenic.

IMA Status:

Approved IMA 1964

Locality:

Sainte-Marie-aux-Mines, France. Link to MinDat.org Location Data.

Name Origin:

Named for the Rauenthal vein system, on which Sainte-Marie-aux-Mines, France, is located.

Name Pronunciation:

Rauenthalite + Pronunciation

Synonym:

ICSD 36047

PDF 35-569

Rauenthalite Image

Images:

Rauenthalite

Comments: Bright white botryoidal to transparent colorless prismatic rauenthalite microcrystals.
Location: Gabe Gottes, Sainte-Marie-aux-Mines, Alsace, Haute-Rhin, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rauenthalite Crystallography

Axial Ratios:

a:b:c =1.0324:1:0.509

Cell Dimensions:

a = 12.564, b = 12.169, c = 6.195, Z = 2; alpha = 89.09°, beta = 79.69°, gamma = 118.58° V = 818.22 Den(Calc)= 2.35

Crystal System:

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

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

By Intensity(I/I_o): 10.8(1), 3.36(0.8), 2.44(0.6),

Physical Properties of Rauenthalite

Cleavage:

None

Color:

Colorless, Snow white.

Density:

2.36

Streak:

white

Optical Properties of Rauenthalite

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2347,KPDmeas= 0.2347,KC= 0.2314
Ncalc = 1.55

Optical Data:

Biaxial (+), a=1.54, b=1.552, g=1.57, bire=0.0300, 2V(Calc)=80, 2V(Meas)=85.

Calculated Properties of Rauenthalite

Electron Density:

Bulk Density (Electron Density)=2.37 gm/cc
note: Specific Gravity of Rauenthalite =2.36 gm/cc.

Fermion Index:

Fermion Index = 0.0005250109
Boson Index = 0.9994749891

Photoelectric:

PE_Rauenthalite= 19.38 barns/electron
U=PE_Rauenthalite x rElectron Density= 45.88 barns/cc.

Radioactivity:

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

Rauenthalite Classification

Dana Class:

40.03.11.01 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 ï¿½ x(H2O)

(40.03.11)Dana Group

40.03.11.01 Rauenthalite Ca3(AsO4)2•10(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 Rauenthalite 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 Rauenthalite :
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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Rauenthalite

Ca3(AsO4)2•10(H2O)
Dana No: 40.03.11.01 Strunz No: 08.CJ.40
Locality:

Notes:

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