Mineralogy Database

Arhbarite Mineral Data

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General Arhbarite Information

Help on Chemical  Formula: Chemical Formula: Cu2Mg(AsO4)(OH)3
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Cu1.98Mg0.88Cu0.09Ni0.01Co0.01(AsO4)1.04(SiO4)0.01(OH)2.92
Help on Environment: Environment: Found on massive dolomite.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Arhbar mine, Bou-Azzer, Morocco. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Arhbarite + Pronunciation Say ARHBARITE
Help on Synonym: Synonym: IMA2002-B

Arhbarite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.889:1:0.8414
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pedial H-M Symbol (1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark blue.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: blue

Optical Properties of Arhbarite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.183,KC= 0.1827
Ncalc = 1.73
Help on Optical Data: Optical Data: Biaxial (?), a=1.72, g=1.74, bire=0.0200, 2V(Meas)=90.
Help on Pleochroism (x): Pleochroism (x): turquoise blue.
Help on Pleochroism (y): Pleochroism (y): turquoise blue.
Help on Pleochroism (z): Pleochroism (z): deep turquoise blue.

Calculated Properties of Arhbarite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.78 gm/cc
note: Specific Gravity of Arhbarite =3.99 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0063400429
Boson Index = 0.9936599571
Help on Photoelectric: Photoelectric: PEArhbarite = 32.27 barns/electron
U=PEArhbarite x rElectron Density= 122.04 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arhbarite is Not Radioactive

Arhbarite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.06)where (AB)2 (XO4) Zq � x(H2O)
  (42.06.05)Dana Group Strashimirite Cu8(AsO4)4(OH)4•5(H2O) P 2/m,P 2,Pm Mono Arhbarite Cu2Mg(AsO4)(OH)3 P1 1 Attikaite! Ca3Cu2Al2(AsO4)4(OH)4•2H2O Pban, Pbam or Pba2 Ortho
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8, AmMin v 89, p 897) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 08.BE.25





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