Verdelite

Routinely heat-treated to lighten the color - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 5 7 to 7.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) 2.90 to 3.40Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) BrittleMichael O?Donoghue, Gems, Sixth Edition (2006) IndistinctWalter Schumann, Gemstones of the world (2001) Sub-ConchoidalArthur Thomas, Gemstones (2009) 1.614 to 1.666Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Uniaxial/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) 0.014 to 0.040Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Strong: dark green - yellow-greenWalter Schumann, Gemstones of the world (2001) 0.017Walter Schumann, Gemstones of the world (2001) GreenHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Transparent,Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) VitreousArthur Thomas, Gemstones (2009) TrigonalHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Prismatic to acicular crystalsMichael O?Donoghue, Gems, Sixth Edition (2006) Verdelite information at mindat.org Afghanistan  Glas (2002) Brazil  Cassedanne and Roditi (1996) Menezes (2009) Mozambique  Henn and Bank (1997) Henn and Bank (1997) Schafer and Arlt (2000) Sri Lanka  Tajikistan  Skrigitil (1996) USA  Fisher et al. (1999) Laurs (2001, 2002, 2004) Freeman (2005)