Euchroite Mineral Data
General Euchroite Information
Chemical Formula:
Cu2(AsO4)(OH)•3(H2O)
Composition:
Molecular Weight = 337.06 gm
Copper 37.71 % Cu 47.20 % CuO
Arsenic 22.23 % As 34.09 % As2 O5
Hydrogen 2.09 % H 18.71 % H2 O
Oxygen 37.97 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Cu2 (AsO4 )(OH)•3(H2 O)
IMA Status:
Valid Species (Pre-IMA) 1823
Locality:
Libethen, Slovakia Link to MinDat.org Location Data.
Name Origin:
From the Greek eu - "good" and chros - "color."
Name Pronunciation:
Euchroite + Pronunciation
Synonym:
ICSD 14322
PDF 39-1358
Euchroite Image
Images:
Images:
Euchroite
Comments: Green, well developed, coarsely-crystalline euchroite on matrix.
Location: L'Ubietová (Libethen) Slovak Republic.
Scale: 1.9 x 1.2 x 0.8 cm.
© Fabre Minerals
Euchroite Crystallography
Axial Ratios:
a:b:c =0.9572:1:0.5807
Cell Dimensions:
a = 10.07, b = 10.52, c = 6.11, Z = 4; V = 647.27 Den(Calc)= 3.46
Crystal System:
Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 21 21 21
X Ray Diffraction:
By Intensity(I/Io ): 5.34(1), 2.83(0.9), 7.37(0.8),
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Physical Properties of Euchroite
Cleavage:
{101} Imperfect, {110} Imperfect
Color:
Leek green, Emerald green.
Density:
3.39 - 3.45, Average = 3.42
Diaphaneity:
Transparent to translucent
Fracture:
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Hardness:
3.5-4 - Copper Penny-Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
green
Optical Properties of Euchroite
Gladstone-Dale:
CI meas = -0.041 (Good) - where the CI = (1-KPDmeas /KC ) CI calc = -0.029 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2048,KPDmeas = 0.2072,KC = 0.1991 Ncalc = 1.67 - 1.69
Optical Data:
Biaxial (+), a=1.695, b=1.698, g=1.733, bire=0.0380, 2V(Calc)=34, 2V(Meas)=29. Dispersion relatively weak.
Pleochroism (x):
none.
Calculated Properties of Euchroite
Electron Density:
Bulk Density (Electron Density)=3.33 gm/cc note: Specific Gravity of Euchroite =3.46 gm/cc.
Fermion Index:
Fermion Index = 0.0001854127 Boson Index = 0.9998145873
Photoelectric:
PEEuchroite = 31.55 barns/electronU=PEEuchroite x r Electron Density= 104.94 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Euchroite is Not Radioactive
Euchroite Classification
Dana Class:
42.06.03.01 (42) Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.06) where (AB)2 (XO4) Zq � x(H2O)
(42.06.03) Dana Group
42.06.03.01 Euchroite Cu2(AsO4)(OH)•3(H2O) P 21 21 21 2 2 2
Strunz Class:
08.DC.07 08 - PHOSPHATES, ARSENATES, VANADATES
08.D - Phosphates, etc
08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
08.DC.07 Euchroite Cu2(AsO4)(OH)•3(H2O) P 21 21 21 2 2 2
Other Euchroite Information
References:
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Euchroite :
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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Euchroite
Cu2(AsO4)(OH)•3(H2O)
Dana No: 42.06.03.01 Strunz No: 08.DC.07
Locality:
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