Euchroite Mineral Data

Euchroite Mineral Data +

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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."

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'Ubietov? (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

Diaphaniety:

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:

None.

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

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:

r_electron=3.33 gm/cc
note: r_Euchroite=3.46 gm/cc.

Fermion Index

Fermion Index = 0.00018
Boson Index = 0.99982

Photoelectric:

PE_Euchroite= 31.55 barns/electron
U=PE_Euchroite x r_electron= 104.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Euchroite is Not Radioactive

Euchroite Classification

Dana Class:

42.6.3.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.6)where (AB)2 (XO4) Zq · x(H2O)

(42.6.3)Dana Group

42.6.3.1 Euchroite Cu2(AsO4)(OH)·3(H2O) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/D.07-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.07 - Nissonite - Euchroite - Spencerite series

VII/D.07-10 Nissonite Cu2Mg2(PO4)2(OH)2·5(H2O) C 2/c 2/m

VII/D.07-20 Strashimirite Cu8(AsO4)4(OH)4·5(H2O) P 2/m,P 2,Pm Mono

VII/D.07-30 Euchroite Cu2(AsO4)(OH)·3(H2O) P 2₁2₁2₁ 2 2 2

VII/D.07-40 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1

VII/D.07-50 Legrandite Zn2(AsO4)(OH)·(H2O) P 2₁/c 2/m

VII/D.07-60 Spencerite Zn4(PO4)2(OH)2·3(H2O) P 2/c 2/m

VII/D.07-70 Nevadaite! (Cu,[],Al,V)6[Al8(PO4)8F8](H2O)23 P 2₁mn 2 2 2

Other Euchroite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Euchroite

Cu2(AsO4)(OH)·3(H2O)
Dana No: 42.6.3.1 Strunz No: VII/D.07-30
Locality:

Notes: