Viridine

Big Photo

Bahia, Brazil
0.18 carats
© Giovanni Scapin 2015

Viridine, also known as mangan-andalusite, is a bright green variety of Andalusite, containing iron and manganese. Gemmy rough is small but it can be cut into attractive intense green stones.
General Information
A variety or type of:Andalusite
Chemical Formula
(Al,Mn
3+
 
)
 
2
SiO
 
4
O
Gemdat.org, Management Team (2012)
Photos of natural/un-cut material from mindat.org
Physical Properties of Viridine
Mohs Hardness7 to 7.5
Arthur Thomas, Gemstones (2009)
Specific Gravity3.05 to 3.21
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
FractureUneven
Arthur Thomas, Gemstones (2009)
Optical Properties of Viridine
Refractive Index1.629 to 1.660
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Optical CharacterBiaxial/-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Birefringence0.007 to 0.013
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Dispersion0.016
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Grass green
Gemdat.org, Management Team (2012)
Causes of ColourIron and manganese content.
Arthur Thomas, Gemstones (2009)
TransparencyTransparent,Translucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
LustreVitreous
Gemdat.org, Management Team (2012)
Crystallography of Viridine
Crystal SystemOrthorhombic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
HabitPrismatic habit with vertically striated prisms which are nearly square in section and capped with pyramids
Michael O’Donoghue, Gems, Sixth edition (2006)
Further Information
Mineral information:Viridine information at mindat.org
Significant Gem Localities
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
      • Ratnapura
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