Guerinite Mineral Data

Guerinite Mineral Data +

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General Guerinite 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 1961

Locality:

Daniel mine, Schneeberg, Sachsen, (Saxony), Germany Link to MinDat.org Location Data.

Name Origin:

Named for H. Guerin.

Synonym:

ICSD 2127

PDF 26-1055

Guerinite Image

Images:

Guerinite

Comments: White blebs of guerinite on erythrite.
Location: Wechsel Schacht, Richelsdorf, Hesse, Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Guerinite Crystallography

Axial Ratios:

a:b:c =2.618:1:3.4852

Cell Dimensions:

a = 17.63, b = 6.734, c = 23.47, Z = 5; beta = 90.6° V = 2,786.22 Den(Calc)= 2.74

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 14(1), 3.01(0.8), 3.89(0.8),

Crystal Structure:

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Catti M , Ferraris G , Acta Crystallographica, Section B , 30 (1974) p.1789-1794, Crystal structure of Ca5(HAsO4)2(AsO4)2*9H2O (guerinite), Locality: synthetic

Physical Properties of Guerinite

Cleavage:

[???] Perfect

Color:

Colorless, White.

Density:

2.68

Diaphaniety:

Transparent to Translucent

Hardness:

1.5 - Between Talc and Gypsum

Luminescence:

Fluorescent.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Guerinite

Gladstone-Dale:

CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2119,KPDmeas= 0.2167,KC= 0.2115

Optical Data:

Biaxial (-), a=1.576, b=1.582, g=1.584, bire=0.0080

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Guerinite

Electron Density:

r_electron=2.69 gm/cc
note: r_Guerinite=2.74 gm/cc.

Fermion Index

Fermion Index = 0.0005
Boson Index = 0.9995

Photoelectric:

PE_Guerinite= 24.25 barns/electron
U=PE_Guerinite x r_electron= 65.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Guerinite is Not Radioactive

Guerinite Classification

Dana Class:

39.2.2.2 (39)Hydrated Acid Phosphates, etc

(39.2)H2 (AB)5 (XO4)4 · x(H2O)

(39.2.2)Dana Group

39.2.2.1 Vladimirite Ca5(AsO3OH)2(AsO4)2·5(H2O) P 2₁/c 2/m

39.2.2.2 Guerinite Ca5(AsO3OH)2(AsO4)2·9(H2O) P 2₁/n 2/m

Strunz Class:

VII/C.24-60 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 Guerinite Information

References:

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

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Guerinite

Ca5(AsO3OH)2(AsO4)2·9(H2O)
Dana No: 39.2.2.2 Strunz No: VII/C.24-60
Locality:

Notes: