Mineral Information and Data:

Andremeyerite
BaFe2+2Si2O7 [CNMNC approved formula]

Named for Andre Marie Meyer (1890- ), Belgian geologist with the Geological Survey of the Belgian Congo, who first collected the mineral.

IMA status : Approved Species 1973 (IMA1972-005)
CLASSIFICATION 
Dana
(8th edition) :
56.02.06c.06  
  (56) Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02) with cations in [4] and/or >[4] coordination
  (56.02.06c) Seidozerite - Lamprophyllite group (Lamprophyllite subgroup)
  
Nickel-Strunz
(10th edition) :
09.BB.20
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BB) Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 7.488 Å, b = 13.785 Å, c = 7.085 Å, b = 118.23°
Crystal Habit: Tiny crystals
Twinning: multiple on {100}
  
Color: Pale emerald-green
Diaphaneity: Transparent to translucent
Hardness (Mohs): 5.5
Measured Density: 4.15 g/cm3
Cleavage: 2; {100} and {010} perfect
  
Geologic Setting: In vesicles of melilite-leucite-nephelinite; may represent crystallization of an associated green glass.
Mineral Association: Nepheline, leucite, clinopyroxene, kirschsteinite, melilite, apatite, magnetite,
gÄotzenite, troilite, glass
  

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