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Diopside

Big Photo

Chrome-Diopside
Russia
0.89 carats
© gemselect.com

Diopside is named after Greek word for "double appearance" because of its crystal shape. It is one of the most common members of the Pyroxene Group.

Diopside has a number of gem-quality varieties, including intense green Chrome diopside and fine blue Violane. Black diopside exhbiiting asterism or the Star effect is known.

Usual weight of cut stones is 1 - 20 carats. Compact fine-grained varieties are used as jewelry-industrial stone.

Diopside Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 
 
 
 

Diopside Gemstones by Size

This table shows distribution of Diopside gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.18 cts
Heaviest:21.22 cts
Average:1.48 cts
Total photos:51
Do you have a larger Diopside? Why not upload a photo?
0.18ct to 2.28ct2.28ct to 4.39ct4.39ct to 6.49ct6.49ct to 8.60ct8.60ct to 10.70ct10.70ct to 12.80ct12.80ct to 14.91ct14.91ct to 17.01ct17.01ct to 19.12ct19.12ct to 21.22ct
General Information
Varieties/Types:
Chrome-Diopside - A chrome-bearing green variety of diopside.
Lavrovite - A green vanadium-bearing variety of Diopside.
Violane - Violet-blue Manganese-bearing variety of diopside
Chemical Formula
CaMgSi
 
2
O
 
6
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Physical Properties of Diopside
Mohs Hardness5 to 6
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity3.22 to 3.40
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Cleavage QualityGood
Walter Schumann, Gemstones of the world (2001)
More from other references
FractureUneven
Walter Schumann, Gemstones of the world (2001)
More from other references
Optical Properties of Diopside
Refractive Index1.664 to 1.730
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterBiaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Birefringence0.024 to 0.030
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismCommon trichroism: light green - yellow green - dark green
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Dispersion0.017 to 0.020
Walter Schumann, Gemstones of the world (2001)
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ChatoyancyBlack star: white sharp rays (commonly 4)
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Colour
Colour (General)Green, yellow, colourless, brown, black
Walter Schumann, Gemstones of the world (2001)
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Causes of ColourGreen (Chromian Diopside), Cr3+ in octahedral coordination; V3+ in octahedral coordination. Yellowish green, Fe2+ in octahedral coordination
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyTransparent,Translucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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LustreVitreous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (General)Violet, orange, yellow, green.
Walter Schumann, Gemstones of the world (2001)
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Fluorescence (Short Wave UV)No respond
Michael O’Donoghue, Gems, Sixth Edition (2006)
Fluorescence (Long-Wave UV)Some green specimens show green
Michael O’Donoghue, Gems, Sixth Edition (2006)
Fluorescence (X-RAY)Dull mustard-yellow glow
Michael O’Donoghue, Gems, Sixth Edition (2006)
Crystallography of Diopside
Crystal SystemMonoclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitPrismatic crystals with nearly square cross-section and twinning common
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Typical of metamorphosed siliceous Ca, Mg-rich rocks of the pyroxene-hornfels or epidote-amphibolite facies; common in skarns, Ca, Mg-rich gneisses and schists, and some kimberlites and peridotites. Less common in alkalic olivine basalts and andesites.
Anthony et al, Handbook of mineralogy (2001)
Inclusions in Diopside
Magnetite needles: may react to magnet - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4
Magnetite, healing cracks, liquid inclusions - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 19
Further Information
Mineral information:Diopside information at mindat.org
Significant Gem Localities
Italy
 
  • Aosta Valley
    • Saint-Marcel
[var: Violane] Gemstones of the world, W.Schumann, 2001, p.190
[var: Lavrovite]
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Bernardmyo
Ted Themelis (2008) Gems & mines of Mogok
        • Kyauk-Pyat-That
Ted Themelis (2008) Gems & mines of Mogok
        • Marble Ark
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
        • Mogok Valley
          • Dattaw-taung (Dattaw hill)
            • Dattaw-mid
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
        • Pein-Pyit (Painpyit; Pyan Pyit)
Ted Themelis (2008) Gems & mines of Mogok
Ted Themelis (2008) Gems & mines of Mogok
Russia
 
  • Lake Baikal area
[var: Lavrovite]
  • Sakha
    • Aldan
      • Inagli Massif
[var: Chrome-Diopside] Gadiyatov (1996)
USA
 
  • New York
    • St. Lawrence County
      • De Kalb
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 405
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