Mineral Information and Data:

Ammonioleucite
(NH4)(Si2Al)O6 [CNMNC approved formula]

Named for "ammonia" in its chemical composition and its relation to "leucite.".

IMA status : Approved Species 1984 (IMA1984-015)
CLASSIFICATION 
Dana
(8th edition) :
76.02.02.02  
  (76) Tectosilicate Al-Si Framework
  (76.02) Feldspathoids and related species
  (76.02.02) Leucite group
  
Nickel-Strunz
(10th edition) :
09.GB.05
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GB) Chains of single connected 4-membered rings
  
Crystal system: Tetragonal System
Point group (H-M): 4/m — dipyramidal
Unit cell: a = 13.214 Å, c = 13.713 Å
Crystal Habit: Submicroscopic crystal aggregates forming surface layers replacing analcime
Twinning: common, repeated on {110}
  
Color: White
Diaphaneity: Translucent
Luster: Resinous to vitreous
Hardness (Mohs): 5.5 - 6
Measured Density: 2.29 g/cm3
Streak: White
  
Geologic Setting: In veinlets, fractures, and cavities in hydrothermally altered crystalline schist, as powdery pseudomorphous replacements of analcime crystals.
Mineral Association: Analcime, dolomite
  

 

Ammonioleucite
Origin: Tatarazawa, Fujioka, Gunma pref., Japan (type locality)
Sample size: 3.5 x 3 x 3 cm
Photo: Tom Loomis

 

Ammonioleucite
(zoom-in of above)

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