Villiaumite

Villiaumite is named after Maxime Villiaume, officer in the colonial artillery corps stationed in northern Madagascar, whose help in the acquisition of mineral and rock collections from Madagascar and Guinea proved invaluable to Alfred Lacroix.

Villiaumite forms translucent to transparent carmine-red to lavender-pink granular masses and rarely cubic crystals. Villiaumite is likely to be soluble in hot water.

Villiaumite has been faceted, but the cut stones are usually very small.

Villiaumite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
General Information
Chemical Formula
NaF
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Villiaumite
Mohs Hardness2
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity2.79
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical Properties of Villiaumite
Refractive Index1.328 to 1.332
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterIsotropic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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PleochroismYellow to pink/deep carmine
Michael O’Donoghue, Gems, Sixth Edition (2006)
Colour
Colour (General)Red
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Anthony et al, Handbook of mineralogy (2001)
Fluorescence & other light emissions
Fluorescence (General)Dark red to orange and yellow fluorescence under SW and LW UV
Anthony et al, Handbook of mineralogy (2001)
Fluorescence (Short Wave UV)May show weak red fluorescence
Michael O’Donoghue, Gems, Sixth Edition (2006)
Crystallography of Villiaumite
Crystal SystemIsometric
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitGranular masses
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Villiaumite occurs in nepheline syenite and nepheline syenite pegmatites.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Further Information
Mineral information:Villiaumite information at mindat.org
Significant Gem Localities
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
Guinea
 
  • Los Archipelago (Los Islands)
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 464
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