Violane

Violane is a coarse violet to light blue, manganese-rich variety of Diopside. It is translucent to opaque material from Piedmont, Italy. Violane is used for ornamental objects.
General Information
A variety or type of:Diopside
Other Names/Trade Names:
Chemical Formula
(Ca,Mg,Mn)SiO
 
3
Gemdat.org, Management Team (2012)
Photos of natural/un-cut material from mindat.org
Physical Properties of Violane
Mohs Hardness5 to 6
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Specific Gravity3.22 to 3.40
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Violane
Refractive Index1.668 to 1.703
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Optical CharacterBiaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Birefringence0.024 to 0.030
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Colour
Colour (General)Violet-blue
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
TransparencyTranslucent,Opaque
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
LustreVitreous
Arthur Thomas, Gemstones (2009)
Crystallography of Violane
Crystal SystemMonoclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
HabitMassive
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Further Information
Mineral information:Violane information at mindat.org
Significant Gem Localities
Italy
 
  • Aosta Valley
    • Saint-Marcel
Gemstones of the world, W.Schumann, 2001, p.190
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