Mineral Information and Data:

Aluminoceladonite
KAlMgSi4O10(OH)2 [CNMNC approved formula]

Named for the French celadon, (sea green), in allusion to its common color. Approved and defined per nomenclature of the micas (IMA, 1998).

IMA status : Approved Species 1998 ()
CLASSIFICATION 
Dana
(8th edition) :
71.02.02a.06d  (This Dana# Added)
  (71) Phyllosilicate Sheets of Six-Membered Rings
  (71.02) with 2:1 Layers
  (71.02.02a) Mica Group (Muscovite subgroup)
  
Nickel-Strunz
(10th edition) :
09.EC.15
  (09) Silicates
  (09.E) Phyllosilicates
  (09.EC) Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 5.22 Ǻ, b = 9.05 Ǻ, c = 10.20 Ǻ, β = 100.4°
Crystal Habit: Micaceous scales, minute; earthy
  
Color: Green, blue-green
Luster: Dull
Hardness (Mohs): ~ 2
Measured Density: 2.95 - 3.05 g/cm3
Cleavage: 1; {001} perfect
  
  

 

Aluminoceladonite
Heulandite partially coloured green due to celadonite inclusions
Origin: Ahmednagar, Maharashtra, India
Sample size: 7 x 6 x 5 cm
Photo: Rob Lavinsky

 

Aluminoceladonite
(zoom-in of above)

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