Narsarsukite

Narsarsukite is named after its discovery locality, at Narsarsuk, southern Greenland.

Narsarsukite forms olive-green, honey-yellow to lemon-yellow, reddish brown, brownish gray, tan, pink crystals of small size. The material can be faceted into small attractive gems.
General Information
Chemical Formula
Na
 
2
(Ti,Fe)Si
 
4
(O,F)
 
11
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Photos of natural/un-cut material from mindat.org
Physical Properties of Narsarsukite
Mohs Hardness6 to 7
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity2.72 to 2.83
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Anthony et al, Handbook of Mineralogy (2001)
Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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FractureUneven,Sub-Conchoidal
Anthony et al, Handbook of Mineralogy (2001)
Optical Properties of Narsarsukite
Refractive Index1.610 to 1.647
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterUniaxial/+
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Birefringence0.033
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Colour
Colour (General)Green
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent,Translucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
LustreVitreous,Pearly
Anthony et al, Handbook of Mineralogy (2001)
Crystallography of Narsarsukite
Crystal SystemTetragonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
HabitCrystals, commonly flat tabular to equant, rarely prismatic, striated, to 3 cm. In divergent, radiating groups; as fine grained segregations, massive.
Anthony et al, Handbook of Mineralogy (2001)
Geological Environment
Where found:In pegmatite (Narssarssuk, Greenland); in quartz veins in syenite intruding limestone (Sweetgrass Hills, Montana, USA); in hornfels, igneous breccia, and marble xenoliths in an intrusive alkalic gabbro-syenite complex (Mont Saint Hilaire, Canada).
Anthony et al, Handbook of Mineralogy (2001)
Further Information
Mineral information:Narsarsukite information at mindat.org
Significant Gem Localities
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
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