Chondrodite

Chondrodite is named after Greek "chondros" - a grain, alluding to its frequent granular appearance.

Transparent to translucent orange-brown specimens exhibiting orange-brown to yellow-brown pleochroism have been reported from Sri Lanka. Transparent deep garnet-red material of gem-quality is found in the Tilly Foster mine, Brewster, New York, USA.

Chondrodite is one of the rarest and most beautiful of gemstones and it is occasionally faceted for collectors.

Chondrodite Gemstones by Colour

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

Chondrodite Gemstones by Size

This table shows distribution of Chondrodite 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:0.09 cts
Heaviest:1.06 cts
Average:0.60 cts
Total photos:3
Do you have a larger Chondrodite? Why not upload a photo?
0.09ct to 0.19ct0.19ct to 0.28ct0.28ct to 0.38ct0.38ct to 0.48ct0.48ct to 0.58ct0.58ct to 0.67ct0.67ct to 0.77ct0.77ct to 0.87ct0.87ct to 0.96ct0.96ct to 1.06ct
General Information
Chemical Formula
(Mg,Fe)
 
5
(SiO
 
4
)
 
2
(F,OH)
 
2
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Chondrodite
Mohs Hardness6 to 6.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity3.10 to 3.20
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityDistinct
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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FractureUneven,Sub-Conchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Chondrodite
Refractive Index1.589 to 1.670
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterBiaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Birefringence0.025 to 0.036
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismOrange-brown to yellow-brown
Michael O’Donoghue, Gems, Sixth Edition (2006)
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DispersionNil
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Yellow, red, brownish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent,Translucent,Opaque
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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LustreVitreous,Resinous
Arthur Thomas, Gemstones (2009)
Fluorescence & other light emissions
Fluorescence (Short Wave UV)Inert to moderate yellow
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Fluorescence (Long-Wave UV)Inert to weak orange
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Crystallography of Chondrodite
Crystal SystemMonoclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitCharacteristically flattened crystals
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:In contact metamorphic zones, in limestones and dolostones, associated with felsic to alkalic plutonic rocks, especially with Fe-B-F metasomatism; in a carbonatite.
Anthony et al, Handbook of mineralogy (2001)
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Further Information
Mineral information:Chondrodite information at mindat.org
Significant Gem Localities
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Mogok Valley
        • On-dan
Ted Themelis (2008) Gems & mines of Mogok
USA
 
  • New York
    • Putnam Co.
      • Town of Southeast
        • Brewster
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 399
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