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.
General Information |
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Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Physical Properties of Chondrodite |
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Mohs Hardness | 6 to 6.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Specific Gravity | 3.10 to 3.20Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Cleavage Quality | DistinctUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Fracture | Uneven,Sub-ConchoidalArthur Thomas, Gemstones (2009) |
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Optical Properties of Chondrodite |
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Refractive Index | 1.589 to 1.670Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Optical Character | Biaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Birefringence | 0.025 to 0.036Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Pleochroism | Orange-brown to yellow-brownMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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Dispersion | NilArthur Thomas, Gemstones (2009) |
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Colour |
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Colour (General) | Yellow, red, brownishUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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Transparency | Transparent,Translucent,OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Lustre | Vitreous,ResinousArthur Thomas, Gemstones (2009) |
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Fluorescence & other light emissions |
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Fluorescence (Short Wave UV) | Inert to moderate yellowHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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Fluorescence (Long-Wave UV) | Inert to weak orangeHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Crystallography of Chondrodite |
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Crystal System | MonoclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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Habit | Characteristically flattened crystalsMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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Geological Environment |
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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) More from other references |
Further Information |
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Mineral information: | Chondrodite information at mindat.org |
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Significant Gem Localities |
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| Myanmar | |
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| Ted Themelis (2008) Gems & mines of Mogok | | USA | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 399 |
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