Ferrarisite Mineral Data

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General Ferrarisite Information

Chemical Formula:

Ca5(AsO3OH)2(AsO4)2•9(H2O)

Composition:

Molecular Weight = 920.22 gm

Calcium 21.78 % Ca 30.47 % CaO

Arsenic 32.57 % As 49.95 % As₂O₅

Hydrogen 2.19 % H 19.58 % H₂O

Oxygen 43.47 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(AsO₃OH)₂(AsO₄)₂•9(H₂O)

Environment:

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

IMA Status:

Approved IMA 1980

Locality:

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

Name Origin:

Named for Giovanni Ferraris (1937- ), Institute of Mineralogy, Crystallography and Geochemistry, University of Turin, Turin, Italy.

Name Pronunciation:

Ferrarisite + Pronunciation

Synonym:

ICSD 200781

PDF 33-280

Ferrarisite Image

Images:

Ferrarisite

Comments: Translucent crystal spray of ferrarisite on matrix.
Location: Gift Grube, Sainte-Marie-aux-Mines, Alsace, Haute-Rhin, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferrarisite Crystallography

Axial Ratios:

a:b:c =1.2338:1:1.6658

Cell Dimensions:

a = 8.294, b = 6.722, c = 11.198, Z = 1; alpha = 106.16°, beta = 92.94°, gamma = 99.2° V = 591.15 Den(Calc)= 2.58

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 10.81(1), 10.84(1), 2.831(0.9),

Crystal Structure:

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Catti M , Chiari G , Ferraris G , Bulletin de Mineralogie , 103 (1980) p.541-546, The structure of ferrarisite, Ca5(HAsO4)2(AsO4)2*9H2O:, disorder, hydrogen bonding, and polymorphism with guerinite, Locality: Sainte Marie-aux-Mines, Alsace, France

Physical Properties of Ferrarisite

Cleavage:

{001} Perfect

Color:

Colorless, White.

Density:

2.63

Diaphaneity:

Transparent

Streak:

white

Optical Properties of Ferrarisite

Gladstone-Dale:

CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2212,KPDmeas= 0.2179,KC= 0.2115
Ncalc = 1.55 - 1.56

Optical Data:

Biaxial (+), a=1.562, b=1.572, g=1.585, bire=0.0230, 2V(Calc)=84, 2V(Meas)=83.

Calculated Properties of Ferrarisite

Electron Density:

Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Ferrarisite =2.63 gm/cc.

Fermion Index:

Fermion Index = 0.000505904
Boson Index = 0.999494096

Photoelectric:

PE_Ferrarisite= 24.25 barns/electron
U=PE_Ferrarisite x rElectron Density= 62.65 barns/cc.

Radioactivity:

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

Ferrarisite Classification

Dana Class:

39.02.03.01 (39)Hydrated Acid Phosphates, etc

(39.02)H2 (AB)5 (XO4)4 · x(H2O)

(39.02.03)Dana Group

39.02.03.01 Ferrarisite Ca5(AsO3OH)2(AsO4)2•9(H2O) P1 1

Strunz Class:

08.CJ.30 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.30 Ferrarisite Ca5(AsO3OH)2(AsO4)2•9(H2O) P1 1

Other Ferrarisite 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 Ferrarisite :
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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Ask about Ferrarisite here :
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Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Ferrarisite

Ca5(AsO3OH)2(AsO4)2•9(H2O)
Dana No: 39.02.03.01 Strunz No: 08.CJ.30
Locality:

Notes: