Mineral Information and Data:

Nosean
Na8(Si6Al6)O24(SO4) • H2O [CNMNC approved formula]

Named after the German mineralogist, Karl Wilhelm Nose (1753-1835). Originally named nosian (1815).

IMA status : Valid species (Pre-IMA 1815) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
76.02.03.02  
  (76) Tectosilicate Al-Si Framework
  (76.02) Feldspathoids and related species
  (76.02.03) Sodalite group
  
Nickel-Strunz
(10th edition) :
09.FB.10
  (09) Silicates
  (09.F) Tektosilicates without Zeolitic H2O
  (09.FB) Tektosilicates with additional anions
  
Crystal system: Cubic System
Point group (H-M): 43m (or 4 3m) — hextetrahedral
Space group: P43n
Unit cell: a = 9.05 - 9.08 Å, Z=1
Crystal Habit: Crystals are dodecahedra, to 2 mm; commonly as grains, or massive.
Twinning: On {111}
  
Color: Colorless, white, gray, gray-brown, blue, black from iron contamination, may be irregularly distributed; colorless to blue in thin section
Diaphaneity: Transparent to translucent
Luster: Vitreous
Hardness (Mohs): 5.5
Measured Density: 2.30 - 2.40 g/cm3
Cleavage: {110}, indistinct
Tenacity: Brittle
Fracture: Uneven to conchoidal
  
Geologic Setting: In silica-deficient alkalic volcanic rocks, principally phonolites.
Mineral Association: Sanidine, mica, leucite, magnetite, ilmenite, titanite, zircon
  

 

Nosean
Origin: Mendig, Laacher See, Rhineland-Palatinate, Germany
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Nosean
Origin: Mendig, Laacher See, Rhineland-Palatinate, Germany
Sample size: Microscopic image
Photo and Owner: Lou Perloff

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