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 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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