Guerinite Mineral Data

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.

Name Pronunciation:

Guerinite + Pronunciation

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 - Prismatic H-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),

Physical Properties of Guerinite

Cleavage:

{???} Perfect

Color:

Colorless, White.

Density:

2.68

Diaphaneity:

Transparent to Translucent

Hardness:

1.5 - Between Talc and Gypsum

Luminescence:

Fluorescent, Short UV=white, Long UV=white.

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
Ncalc = 1.57 - 1.58

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:

Bulk Density (Electron Density)=2.69 gm/cc
note: Specific Gravity of Guerinite =2.74 gm/cc.

Fermion Index:

Fermion Index = 0.000505904
Boson Index = 0.999494096

Photoelectric:

PE_Guerinite= 24.25 barns/electron
U=PE_Guerinite x rElectron Density= 65.27 barns/cc.

Radioactivity:

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

Guerinite Classification

Dana Class:

39.02.02.02 (39)Hydrated Acid Phosphates, etc

(39.02)H2 (AB)5 (XO4)4 ï¿½ x(H2O)

(39.02.02)Dana Group

39.02.02.01 Vladimirite Ca5(AsO3OH)2(AsO4)2•5(H2O) P 2₁/c 2/m

39.02.02.02 Guerinite Ca5(AsO3OH)2(AsO4)2•9(H2O) P 2₁/n 2/m

Strunz Class:

08.CJ.75 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CJ -With only large cations

08.CJ.75 Guerinite Ca5(AsO3OH)2(AsO4)2•9(H2O) P 2₁/n 2/m

Other Guerinite 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 Guerinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Guerinite

Ca5(AsO3OH)2(AsO4)2•9(H2O)
Dana No: 39.02.02.02 Strunz No: 08.CJ.75
Locality:

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