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 % As₂O₅

Hydrogen 2.09 % H 18.71 % H₂O

Oxygen 37.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₂(AsO₄)(OH)•3(H₂O)

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:

Euchroite

Comments: Dark green, blocky crystals of euchroite on matrix.
Location: Missoula County, Montana, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Euchroite

Comments: Green, well developed, coarsely-crystalline euchroite on matrix.
Location: L'UbietovÃ¡ (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 - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 5.34(1), 2.83(0.9), 7.37(0.8),

Forms:

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Forms: ( 3 0 2) ( 2 0 1) ( 0 1 0) ( 1 0 1) ( 1 0 0) ( 1 1 0)

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Crystal Structure:

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Finney J J , Acta Crystallographica , 21 (1966) p.437-440, Refinement of the crystal structure of euchroite, Cu2(AsO4)(OH)*3H2O

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:

PE_Euchroite= 31.55 barns/electron
U=PE_Euchroite x rElectron 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 2₁2₁2₁ 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 2₁2₁2₁ 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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Ask about Euchroite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Euchroite Specimen Label here :

Euchroite

Cu2(AsO4)(OH)•3(H2O)
Dana No: 42.06.03.01 Strunz No: 08.DC.07
Locality:

Notes: