Mineral Information and Data:

Barrerite
Na8(Si28Al8)O72 • 26H2O [CNMNC approved formula]

Named for Richard Maling Barrer (1910- ), New Zealand-born British teacher and student of the chemistry of zeolites.

IMA status : Approved Species 1975 ()
CLASSIFICATION 
Dana
(8th edition) :
77.01.04.05  
  (77) Tectosilicate Zeolite group
  (77.01) true zeolites
  (77.01.04) Heulandite and related species
  
Nickel-Strunz
(10th edition) :
09.GE.15
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GE) Chains of T10O20 Tetrahedra
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Space group: Amma
Unit cell: a = 13.64Å, b = 18.2Å, c = 17.84Å
Crystal Habit: As well-formed, laminar crystals, to 5 mm, with {010}, {011}, and {111}; {001} is common, but of poor quality.
  
Color: White to slightly pink
Diaphaneity: Transparent to translucent
Luster: Vitreous
Measured Density: 2.13 g/cm3
Cleavage: Perfect on {010}
  
Geologic Setting: On the walls of large fractures in deeply weathered andesitic and rhyolitic lavas.
Mineral Association: Heulandite
  

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