Mineral Information and Data:

Edingtonite
Ba(Si3Al2)O10 • 4H2O [CNMNC approved formula]

Named for James Edington (1787-1844), mineral collector of Glasgow, Scotland, the discoverer of the mineral. First published in 1825. Defined per nomenclature for zeolite minerals (IMA, 1997).

IMA status : Approved Species 1997 ()
CLASSIFICATION 
Dana
(8th edition) :
77.01.05.06  
  (77) Tectosilicate Zeolite group
  (77.01) true zeolites
  (77.01.05) Natrolite and related species
  
Nickel-Strunz
(10th edition) :
09.GA.15
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GA) Zeolites with T5O10 Units - The Fibrous Zeolites
  
Crystal system: Orthorhombic System
Point group (H-M): 222 — disphenoidal
Space group: P21212
Unit cell: a = 9.550Å, b = 9.665Å, c =6.523Å; Z = 2
Crystal Habit: Prismatic crystals exhibit pseudotetragonal pyramid or sphenoid forms, to 10 cm; also massive.
Twinning: On {110} and about [001]
  
Color: White, grayish, pink; colorless in thin section
Diaphaneity: Transparent to translucent
Luster: Vitreous
Hardness (Mohs): 4 - 4.5
Measured Density: 2.73 - 2.78 g/cm3
Cleavage: {110}, perfect
  
Geologic Setting: In cavities in mafic igneous rocks and nepheline syenites; in carbonatites; in hydrothermal veins.
Mineral Association: Thomsonite, analcime, natrolite, harmotome, brewsterite, prehnite, calcite
  
Other Properties: Piezoelectric. Pyroelectric.

 

Edingtonite
Edingtonite with calcite.
Origin: Ice River Complex, Golden Mining Division, British Columbia, Canada
Sample size: 6.3 x 4.5 x 3.2 cm
Photo: Dan Weinrich

 

Edingtonite
(zoom-in of above)

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