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Arhbarite Mineral Data
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General Arhbarite Information
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 Chemical Formula: |
Cu2Mg(AsO4)(OH)3 |
| Composition: |
Molecular Weight = 349.16 gm |
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Magnesium 6.13 % Mg 10.16 % MgO |
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Cobalt 0.17 % Co 0.21 % CoO |
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Copper 37.67 % Cu 47.16 % CuO |
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Silicon 0.08 % Si 0.17 % SiO2 |
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Nickel 0.17 % Ni 0.21 % NiO |
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Arsenic 22.32 % As 34.23 % As2O5 |
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Hydrogen 0.84 % H 7.53 % H2O |
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Oxygen 32.63 % O |
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______ ______ |
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100.00 % 99.68 % = TOTAL OXIDE |
| Empirical Formula: |
Cu1.98Mg0.88Cu0.09Ni0.01Co0.01(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 |
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Arhbarite Image |
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Images:
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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 |
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Arhbarite Crystallography
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| 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 - Pedial H-M Symbol (1) Space Group: P1 |
| 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), |
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Physical Properties of Arhbarite
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| Cleavage: |
None |
| Color: |
Dark blue. |
| Diaphaneity: |
Translucent |
| Habit: |
Fibrous - Crystals made up of fibers. |
| Habit: |
Spherical - Spherical, rounded aggregates. |
| Luster: |
Vitreous (Glassy) |
| Streak: |
blue |
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Optical Properties of Arhbarite
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| 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. |
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Calculated Properties of Arhbarite
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| Electron Density: |
Bulk Density (Electron Density)=3.78 gm/cc
note: Specific Gravity of Arhbarite =3.99 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0063400429
Boson Index = 0.9936599571 |
| Photoelectric: |
PEArhbarite = 32.27 barns/electron
U=PEArhbarite x rElectron Density= 122.04 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arhbarite is Not Radioactive |
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Arhbarite Classification
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| Dana Class: |
42.06.05.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.06)where (AB)2 (XO4) Zq � x(H2O) |
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(42.06.05)Dana Group |
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42.06.05.01 Strashimirite Cu8(AsO4)4(OH)4•5(H2O) P 2/m,P 2,Pm Mono |
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42.06.05.02 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1 |
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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 |
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08.B - Phosphates, etc. with Additional Anions, without H2O |
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08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1 |
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08.BE.25 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1 |
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08.BE.25 Gilmarite! Cu3(AsO4)(OH)3 P1 1 |
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Other Arhbarite Information
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| 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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Arhbarite
Cu2Mg(AsO4)(OH)3
Dana No: 42.06.05.02 Strunz No: 08.BE.25
Locality:
Notes:
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