Attikaite Mineral Data
General Attikaite Information
Chemical Formula:
Ca3Cu2Al2(AsO4)4(OH)4•2H2O
Composition:
Molecular Weight = 944.79 gm
Calcium 12.47 % Ca 17.45 % CaO
Magnesium 0.10 % Mg 0.17 % MgO
Aluminum 5.63 % Al 10.63 % Al2 O3
Iron 0.12 % Fe 0.15 % FeO
Copper 12.98 % Cu 16.25 % CuO
Arsenic 29.66 % As 45.49 % As2 O5
Phosphorus 0.39 % P 0.90 % P2 O5
Hydrogen 0.85 % H 7.60 % H2 O
Sulfur 0.54 % S 1.36 % SO3
Oxygen 37.26 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca2.94 Cu1.93 Al1.97 Mg0.04 Fe2+ 0.02 As3.74 S0.16 P0.12 O16.08 (OH)3.87 �2.05(H2 O)
Environment:
Secondary mineral in copper and arsenic deposits.
IMA Status:
Approved IMA 2006 (Dana # Added)
Locality:
Christiana mine No. 132, Kamareza, Lavrion District, Atti� Prefecture, Greece. Link to MinDat.org Location Data.
Name Origin:
Named for the locality.
Synonym:
IMA2006-017
Attikaite Image
Images:
Attikaite
Comments: Light blue crusts of attikaite on a gossenous matrix.
Location: Christiana Mine, Lavrion (Laurium) Mining District, Attica Peninsula, Greece.
Scale: Picture size 5 mm.
© John Betts - Fine Minerals
Attikaite Crystallography
Axial Ratios:
a:b:c =1.2208:1:2.7783
Cell Dimensions:
a = 10.01, b = 8.199, c = 22.78, Z = 4; V = 1,869.60 Den(Calc)= 3.36
Crystal System:
Orthorhombic Space Group: Pban, Pbam or Pba2
X Ray Diffraction:
By Intensity(I/Io ): 22.8(1), 5.01(0.9), 2.78(0.7), 11.36(0.6), 2.503(0.5), 3.38(0.5), 2.682(0.3), 2.292(0.2),
Physical Properties of Attikaite
Cleavage:
{001} Perfect
Color:
Light blue, Greenish blue.
Density:
3.2
Diaphaneity:
Transparent
Fracture:
Flexible - Flexible fragments.
Habit:
Encrustations - Forms crust-like aggregates on matrix.
Hardness:
2-2.5 - Gypsum-Finger Nail
Luster:
Vitreous (Glassy)
Streak:
pale blue
Optical Properties of Attikaite
Gladstone-Dale:
CI meas = -0.055 (Good) - where the CI = (1-KPDmeas /KC ) CI calc = -0.005 (Superior) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1915,KPDmeas = 0.201,KC = 0.1905 Ncalc = 1.61 - 1.64
Optical Data:
Biaxial (-), a=1.642, b=1.644, g=1.644, bire=0.0020
Calculated Properties of Attikaite
Electron Density:
Bulk Density (Electron Density)=3.22 gm/cc note: Specific Gravity of Attikaite =3.36 gm/cc.
Fermion Index:
Fermion Index = 0.0005171588 Boson Index = 0.9994828412
Photoelectric:
PEAttikaite = 27.59 barns/electronU=PEAttikaite x r Electron Density= 88.92 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Attikaite is Not Radioactive
Attikaite Classification
Dana Class:
42.06.05.03 (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.DJ.45 08 - PHOSPHATES, ARSENATES, VANADATES
08.D - Phosphates, etc
08.DJ -With large and medium-sized cations, (OH, etc.):RO4 = 1:l
08.DJ.45 Attikaite ! Ca3Cu2Al2(AsO4)4(OH)4•2H2O Pban, Pbam or Pba2 Ortho
Other Attikaite Information
References:
NAME( Geology of Ore Deposits, v49:720) PHYS. PROP.(Geology of Ore Deposits, v49:720) OPTIC PROP.(Geology of Ore Deposits, v49:720)
See Also:
Links to other databases for Attikaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Attikaite
Ca3Cu2Al2(AsO4)4(OH)4•2H2O
Dana No: 42.06.05.03 Strunz No: 08.DJ.45
Locality:
Notes:
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