| General Information |
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| A variety or type of: | Jade |
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| Varieties/Types: | |
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| Other Names/Trade Names: | |
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| Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Jadeite Treatments |
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Commonly impregnated with wax to improve luster. Bleached in acid to remove the brownish hue: creates fine cracks. Stabilized with polymer: reflecting light, distinct luster of filled cracks. Hot point and scratch tests.
Dye concentration may be seen in small cracks (grain boundaries) resulting of bleaching and along fractures: may be discolored by acetone or diluted acid (depends on impregnation) - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4 |
| Physical Properties of Jadeite |
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| Mohs Hardness | 7Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 3.30 to 3.38Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Tenacity | BrittleWalter Schumann, Gemstones of the world (2001) |
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| Cleavage Quality | GoodAnthony et al, Handbook of mineralogy (2001) More from other references |
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| Fracture | SplinteryAnthony et al, Handbook of mineralogy (2001) More from other references |
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| Optical Properties of Jadeite |
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| Refractive Index | 1.654 to 1.667Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Optical Character | Biaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Birefringence | 0.013Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Pleochroism | NilArthur Thomas, Gemstones (2009) |
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| Dispersion | NilArthur Thomas, Gemstones (2009) |
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| Colour |
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| Colour (General) | Green, white, pink, red, orange, yellowish, brown, red-violetUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Colour (Chelsea Filter) | No reaction. Dyed green: if present, a red reaction is diagnostic (chromium)Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Causes of Colour | "Emerald" green (chrome jadeite), Cr3+ in octahedral coordination. Yellowish green, Fe3+ in octahedral coordination. Violet ("lavender jadeite"), Fe2+-O-Fe3+ charge transfer, synthetic is colored by Mn3+W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) |
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| Transparency | Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Lustre | Greasy,DullWalter Schumann, Gemstones of the world (2001) More from other references |
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| Fluorescence & other light emissions |
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| Fluorescence (General) | Greenish jadeite: very weak - whitish glimmerWalter Schumann, Gemstones of the world (2001) |
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| Fluorescence (Long-Wave UV) | Inert to whitish-greenish; bleached stones: possible bluish-white or yellow-green reactionHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Crystallography of Jadeite |
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| Crystal System | MonoclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Habit | Intergrown, grainy aggregateWalter Schumann, Gemstones of the world (2001) More from other references |
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| Geological Environment |
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| Where found: | Occurs in highly metamorphosed sodium-rich serpentinous rocks often in association with aragonite, calcite, quartz, serpentine, vesuvianite. However, the majority of gem-quality jadeite is recovered in the form of loose boulders that have survived the weathering away of their matrix.Arthur Thomas, Gemstones (2009) More from other references |
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| Further Information |
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| Mineral information: | Jadeite information at mindat.org |
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| Significant Gem Localities |
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| Cuba | | |
| Garcia-Casco et al. (2009) | | Japan | | |
| Chihara (1999) | |
| Chihara (1999) | | Kazakhstan | | |
| Spiridonov (1998) | | Myanmar | |
- Hpakant Township (Hpakan; Phakant; Phakan)
- Hpakant-Tawmaw Jade Tract
- Hpakant (Hpakan; Phakant; Phakan)
| Ou Yang (1999) | |
| Ou Yang (1999) | |
| Ou Yang (1999) | |
| Ou Yang (1999) | |
| Ou Yang (1999) | |
| Ou Yang (1999) |
- Mohnyin Township (Moe Hnyin Township)
| Ou Yang (1999) |
- Hkamti Township (Khamti Township)
| Ou Yang (1999) | |
| Ou Yang (1999) | | Russia | | |
| Spiridonov (1998) |
- Yamalo-Nenets Autonomous Okrug
| Yushkin (1996) | | Turkey | | |
| Okay (2002) |
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