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Attikaite

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Formula:
Ca3Cu2Al2(AsO4)4(OH)4 · 2H2O
System:
Orthorhombic
Colour:
light blue, greenish blue
Hardness:
2½ - 3
Name:
Named for the old Greek region of Attika and the Attiki Prefecture, respectively, in which the Lavrion District is situated.
This page provides mineralogical data about Attikaite.

Classification of Attikaite

Approved 2006
8.DJ.45

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
J : With large and medium-sized cations, (OH, etc.):RO4 = 1:1
42.9.10.

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
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http://www.mindat.org/min-30778.html
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Type Occurrence of Attikaite

General Appearance of Type Material:
sparsely scattered, minute botryoids of pale green aggregates, comprised of submicroscopic, intergrown needles
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Science, Moscow, Russia, Catalog no. 3435/1.

Physical Properties of Attikaite

Colour:
light blue, greenish blue
Streak:
pale blue
Hardness (Mohs):
2½ - 3
Hardness Data:
Measured
Cleavage:
Perfect
mica-like on {001}
Density:
3.2(2) g/cm3 (Measured)    
Comment:
by heavy liquids

Crystallography of Attikaite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pban
Cell Parameters:
a = 10.01Å, b = 8.199Å, c = 22.78Å
Ratio:
a:b:c = 1.221 : 1 : 2.778
Unit Cell Volume:
V 1,869.60 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
22.8 (100)
11.36 (60)
5.01 (90)
2.780 (70)
2.682 (30)
2.503 (50)
2.292 (20)

Optical Data of Attikaite

Type:
Biaxial (-)
RI values:
nα = 1.642(2) nβ = 1.644(2) nγ = 1.644(2)
2V:
Measured: 10° (8)
Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Attikaite

Formula:
Ca3Cu2Al2(AsO4)4(OH)4 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Attikaite to other Species

8.DJ.05JohnwalkiteK(Mn2+,Fe2+,Fe3+)2(Nb5+,Ta5+)(PO4)2O2 · 2(H2O,OH)
8.DJ.05OlmsteaditeKFe22+(Nb5+,Ta5+)(PO4)2O2 · 2H2O
8.DJ.10GatumbaiteCaAl2(PO4)2(OH)2 · H2O
8.DJ.15CamgasiteCaMg(AsO4)(OH) · 5H2O
8.DJ.20PhosphofibriteK<0.5(Fe3+,Cu)8(PO4)6(OH)7 · 7H2O
8.DJ.20Meurigite-KKFe83+(PO4)6(OH)7 · 6.5H2O
8.DJ.20Meurigite-NaNaFe83+(PO4)6(OH)7 · 6.5H2O
8.DJ.25JungiteCa2Zn4Fe83+(PO4)9(OH)9 · 16H2O
8.DJ.30WycheproofiteNaAlZr(PO4)2(OH) · H2O
8.DJ.35ErcititeNa2Mn23+(PO4)2(OH)2 · 4H2O
8.DJ.40MrázekiteBi2Cu3(PO4)2O2(OH)2 · H2O

Other Names for Attikaite

Name in Other Languages:
German:Attikait

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Attikaite

Reference List:
Chukanov, N.V., Pekov, I.V., Zadov, A.E. (2007): Attikaite, Ca3Cu2Al2(AsO4)4(OH)4•2H2O, a new mineral. Proceedings of the Russian Mineralogical Society (Zapiski RMO), 136(2), 17-24. [American Mineralogist 94,1076 (2009)(abstract)]

Chukanov, N.V., Pekov, I.V., Zadov, A.E. (2007): Attikaite, Ca3Cu2Al2(AsO4)4(OH)4•2H2O, a new mineral species. Geology of Ore Deposits, 49(8), 720-726. [ENGLISH TRANSLATION]

Internet Links for Attikaite

Localities for Attikaite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
ZRMO 136(2),17-24(2007)
N. V. Chukanov, I. V. Pekov and A. E. Zadov (2007) Attikaite, Ca3Cu2Al2(AsO4)4(OH)4 · 2H2O, a new mineral species Geology of Ore Deposits 49: 720-726
Spain
 
  • Valencian Community
    • Castellón
Mineralogía de la concesión San Rafael, Villahermosa del Río, Castellón, España
        • San Rafael claim
- Cócera, H., Menor-Salván, C. and Muñoz-Alvarado, R. (2010): Mineralogía de la concesión San Rafael, Villahermosa del Río, Castellón, España. Acopios, 1, 1-51. [http://mti-acopios.blogspot.com/ ; http://issuu.com/malacate/docs/acopios-1-1?mode=a_p]
Mineral and/or Locality  
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