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 % Al₂O₃

Iron 0.12 % Fe 0.15 % FeO

Copper 12.98 % Cu 16.25 % CuO

Arsenic 29.66 % As 45.49 % As₂O₅

Phosphorus 0.39 % P 0.90 % P₂O₅

Hydrogen 0.85 % H 7.60 % H₂O

Sulfur 0.54 % S 1.36 % SO₃

Oxygen 37.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_2.94Cu_1.93Al_1.97Mg_0.04Fe²⁺_0.02As_3.74S_0.16P_0.12O_16.08(OH)_3.87ï¿½2.05(H₂O)

Environment:

Secondary mineral in copper and arsenic deposits.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Christiana mine No. 132, Kamareza, Lavrion District, Attiï¿½ 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

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

By Intensity(I/I_o): 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:

PE_Attikaite= 27.59 barns/electron
U=PE_Attikaite x rElectron 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 ï¿½ 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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Print or Cut-and-Paste your Attikaite Specimen Label here :

Attikaite

Ca3Cu2Al2(AsO4)4(OH)4•2H2O
Dana No: 42.06.05.03 Strunz No: 08.DJ.45
Locality:

Notes:

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