Mineral Information and Data:

Aerinite
(Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12] [CNMNC approved formula]

Named in 1830 from the Greek root "aer-", alluding to atmosphere or sky and hence the color, sky blue.

IMA status : Redefined IMA Approved; 2004 ()
CLASSIFICATION 
Dana
(8th edition) :
68.01.03.01  
  (68) Inosilicate Structures with Chains of More Than One Width
  (68.01)
  (68.01.03)
  
Nickel-Strunz
(10th edition) :
09.DB.45
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DB) with 2-periodic single chains, Si2O6; Pyroxene-related minerals
  
Crystal system: Monoclinic System
Point group (H-M): Unknown — Unk
Unit cell: a = 14.690 Å, b = 16.872 Å, c = 5.170 Å, b = 94°45
Crystal Habit: Fibrous
  
Color: Sky Blue, blue-green
Diaphaneity: Translucent to semitransparant
Luster: Vitreous
Hardness (Mohs): 3
Measured Density: 2.48 g/cm3
Streak: Bluish White
  
Geologic Setting: A hydrothermal mineral of the zeolite facies, formed at relatively low temperature, in fractures cutting mafic igneous rocks (Saint-Pandelon, France).
Mineral Association: Prehnite, scolecite, mesolite (Saint-Pandelon, France)
  
Comments: A rare, chemically complex carbonate-bearing silicate.

 

Aerinite
Blue aerinite on matrix
Origin: Lérida, Spain
Sample size: 2.5 x 3.5 cm
Photo: Diederik Visser

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