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 % As2 O5
Hydrogen 2.19 % H 19.58 % H2 O
Oxygen 43.47 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca5 (AsO3 OH)2 (AsO4 )2 •9(H2 O)
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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEGuerinite = 24.25 barns/electronU=PEGuerinite x r Electron 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 � 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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Guerinite
Ca5(AsO3OH)2(AsO4)2•9(H2O)
Dana No: 39.02.02.02 Strunz No: 08.CJ.75
Locality:
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