Mineral Information and Data:

Astrocyanite-(Ce)  
Cu2Ce2(UO2)(CO3)5(OH)2 • 1.5H2O [CNMNC approved formula]

Named from the Greek for "star" and "blue" alluding to the bluish star-like habit and the dominant Ce.

IMA status : Approved Species 1990 (IMA1989-032)
CLASSIFICATION 
Dana
(8th edition) :
16b.01.06.01  
  (16b) Carbonates - Hydroxyl or Halogen
  (16b.01) where (A)m (B)n (XO3)p Zq, with (m+n):p=1:1
  (16b.01.06)
  
Nickel-Strunz
(10th edition) :
05.EF.05
  (05) Carbonates and Nitrates
  (05.E) Uranyl Carbonates
  (05.EF) UO2:CO3 = 1:5
  
Crystal system: Hexagonal System
Point group (H-M): 6/mmm (or 6/m 2/m 2/m) — dihexagonal-dipyramidal
Unit cell: a = 14.96(2) Å, c = 28.86(4) Å, Z = 12
Crystal Habit: Tabular {0001} crystals, to 1 mm, isolated or forming flat rosettes.
  
Color: Pale blue, bright blue, blue-green
Diaphaneity: Translucent to opaque
Luster: Vitreous
Hardness (Mohs): 2 - 3
Measured Density: 3.8 g/cm3
Cleavage: On {0001}
  
Geologic Setting: In the oxidation zone of the uranium-bearing portion of a Cu–Co deposit.
Mineral Association: Uraninite, uranophane, kamotoite-(Y), fran¸coisite-(Nd), shabaite-(Nd), schuilingite-(Nd), masuyite
  
Other Properties: Radioactive.

<<< BACK TO MINERAL SEARCH