Arhbarite Mineral Data

General Arhbarite Information

Chemical Formula:

Cu2Mg(AsO4)(OH)3

Composition:

Molecular Weight = 349.16 gm

Magnesium 6.13 % Mg 10.16 % MgO

Cobalt 0.17 % Co 0.21 % CoO

Copper 37.67 % Cu 47.16 % CuO

Silicon 0.08 % Si 0.17 % SiO₂

Nickel 0.17 % Ni 0.21 % NiO

Arsenic 22.32 % As 34.23 % As₂O₅

Hydrogen 0.84 % H 7.53 % H₂O

Oxygen 32.63 % O

______ ______

100.00 % 99.68 % = TOTAL OXIDE

Empirical Formula:

Cu_1.98Mg_0.88Cu_0.09Ni_0.01Co_0.01(AsO₄)_1.04(SiO₄)_0.01(OH)_2.92

Environment:

Found on massive dolomite.

IMA Status:

Approved IMA 1982

Locality:

Arhbar mine, Bou-Azzer, Morocco. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Arhbarite + Pronunciation

Synonym:

IMA2002-B

Arhbarite Image

Images:

Arhbarite

Comments: Deep blue, smooth, botryoidal aggregate of arhbarite in a 2mm vug associated with atacamite.
Location: El Guanaco mine, Atacama, Tal Tal(?), Chile. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Arhbarite Crystallography

Axial Ratios:

a:b:c =0.889:1:0.8414

Cell Dimensions:

a = 5.315, b = 5.978, c = 5.03, Z = 1; alpha = 113.58°, beta = 97.14°, gamma = 89.3° V = 145.33 Den(Calc)= 3.99

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 4.57(1), 4.51(0.9), 3.72(0.6),2.47(0.5), 2.6(0.5), 2.63(0.4), 3.25(0.4),

Physical Properties of Arhbarite

Cleavage:

None

Color:

Dark blue.

Diaphaneity:

Translucent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Spherical - Spherical, rounded aggregates.

Luster:

Vitreous (Glassy)

Streak:

blue

Optical Properties of Arhbarite

Gladstone-Dale:

CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.183,KC= 0.1827
Ncalc = 1.73

Optical Data:

Biaxial (?), a=1.72, g=1.74, bire=0.0200, 2V(Meas)=90.

Pleochroism (x):

turquoise blue.

Pleochroism (y):

turquoise blue.

Pleochroism (z):

deep turquoise blue.

Calculated Properties of Arhbarite

Electron Density:

Bulk Density (Electron Density)=3.78 gm/cc
note: Specific Gravity of Arhbarite =3.99 gm/cc.

Fermion Index:

Fermion Index = 0.0063400429
Boson Index = 0.9936599571

Photoelectric:

PE_Arhbarite= 32.27 barns/electron
U=PE_Arhbarite x rElectron Density= 122.04 barns/cc.

Radioactivity:

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

Arhbarite Classification

Dana Class:

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

(42.06)where (AB)2 (XO4) Zq · x(H2O)

(42.06.05)Dana Group

42.06.05.01 Strashimirite Cu8(AsO4)4(OH)4•5(H2O) P 2/m,P 2,Pm Mono

42.06.05.02 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1

42.06.05.03 Attikaite! Ca3Cu2Al2(AsO4)4(OH)4•2H2O Pban, Pbam or Pba2 Ortho

Strunz Class:

08.BE.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1

08.BE.25 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1

08.BE.25 Gilmarite! Cu3(AsO4)(OH)3 P1 1

Other Arhbarite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin v 89, p 897) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Arhbarite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Arhbarite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Arhbarite Specimen Label here :

Arhbarite

Cu2Mg(AsO4)(OH)3
Dana No: 42.06.05.02 Strunz No: 08.BE.25
Locality:

Notes: