Ferrarisite Mineral Data

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)

IMA Status:

Approved IMA 1980

Locality:

Link to MinDat.org Location Data.

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

Diaphaniety:

Transparent

Streak:

white

Optical Properties of Ferrarisite

Gladstone-Dale:

CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2221,KPDmeas= 0.2179,KC= 0.2115

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:

r_electron=2.58 gm/cc
note: r_Ferrarisite=2.63 gm/cc.

Fermion Index

Fermion Index = 0.0005
Boson Index = 0.9995

Photoelectric:

PE_Ferrarisite= 24.25 barns/electron
U=PE_Ferrarisite x r_electron= 62.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrarisite is Not Radioactive

Ferrarisite Classification

Dana Class:

39.2.3.1 (39)Hydrated Acid Phosphates, etc

(39.2)H2 (AB)5 (XO4)4 · x(H2O)

(39.2.3)Dana Group

39.2.3.1 Ferrarisite Ca5(AsO3OH)2(AsO4)2·9(H2O) P1 1

Strunz Class:

VII/C.24-50 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 Ferrarisite 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 Ferrarisite :
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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Ferrarisite

Ca5(AsO3OH)2(AsO4)2·9(H2O)
Dana No: 39.2.3.1 Strunz No: VII/C.24-50
Locality:

Notes: