Mineral Information and Data:

Agardite-(Ce)
Cu2+6Ce(AsO4)3(OH)6 • 3H2O [CNMNC approved formula]

Named as the Ce-dominant analog of agardite-(La) and agardite-(Y).

IMA status : Approved Species 2004 (IMA2003-030)
CLASSIFICATION 
Dana
(8th edition) :
42.05.01.02e  (This Dana# Added)
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.05) where (A)2 (XO4) Zq · x(H2O)
  (42.05.01) Mixite group (Arsenate Series)
  
Nickel-Strunz
(10th edition) :
08.DL.15
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DL) With large and medium-sized cations, (OH, etc.):RO4 = 2:1
  
Crystal system: Hexagonal System
Point group (H-M): 6/m — dipyramidal
Unit cell: a = 13.59 Å, c = 5.89 Å
Crystal Habit: Acicular - Occurs as needle-like crystals
  
Color: Light green, yellowish green
Diaphaneity: Transparent, Translucent
Luster: Vitreous
Hardness (Mohs): 3
Measured Density: 3.72 g/cm3
Tenacity: Brittle
Fracture: Conchoidal
Streak: Greenish white
  
Geologic Setting: Oxidation products that formed on barite and quartz first noticed in 1970.
  

 

Agardite-(Ce)
Acicular crystal sprays of agardite-(Ce) to 1mm on goethite
Origin: Kamareza Mines, Lavrion District,
Attikí (Attica; Attika) Prefecture, Greece
Photo and Owner: Steve Rust

 

Agardite-(Ce)
Green acicular to fibrous in spherical aggregates of agardite-(Ce) in a vug.
Origin: Hayashi, Setoda, Ikuchi Island, Hiroshima Prefecture, Chugoku Region, Honshu Island, Japan.
Photo: © Rruff Database

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