Verdelite

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 7.0 – 7.5

Specific Gravity 2.9 – 3.4

Refractive Index 1.614 – 1.666

Crystal System Trigonal

Luster Vitreous

Cleavage Indistinct

Fracture Sub-Conchoidal

Color various

Birefringence 0.014

Dispersion 0.017

Pleochroism Strong: dark green - yellow-green

Mohs Hardness

Mohs hardness of Verdelite shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Verdelite
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase
7	Quartz	●
8	Topaz
9	Corundum
10	Diamond

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Verdelite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

Treatments

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)

About Verdelite

ベルデライトはトルマリンの緑色変種の総称で、クロムに富む草緑色からオリーブグリーン、青みがかった緑まで幅広い色域を含みます。最高品質の鮮やかなエメラルドグリーンの石はブラジル、ナイジェリア、タンザニアから産出されます。クロムに富む「クロムトルマリン」はパライバトルマリン並みの高評価を受けることもあります。豊富な色の変化と強い多色性が宝石として魅力的な石です。

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