| General Information |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Danburite Treatments |
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| A pink color has been noted to form on irradiation (C.L. Key, unpublished observation). One would expect this to bleach on being heated; fading in light is also a possibility - Nassau (1984) |
| Physical Properties of Danburite |
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| Mohs Hardness | 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Specific Gravity | 2.97 to 3.03Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Cleavage Quality | IndistinctArthur Thomas, Gemstones (2009) |
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| Fracture | Sub-ConchoidalArthur Thomas, Gemstones (2009) |
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| Optical Properties of Danburite |
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| Refractive Index | 1.627 to 1.639Herve 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 | 0.006Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Pleochroism | Weak: pale yellow - yellowHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Dispersion | 0.017Arthur Thomas, Gemstones (2009) |
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| Colour |
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| Colour (General) | Yellow, yellow-brown, brown, pink, colourlessUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Transparency | TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Lustre | VitreousArthur Thomas, Gemstones (2009) |
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| Fluorescence & other light emissions |
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| Fluorescence (Short Wave UV) | Weaker than LWHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Fluorescence (Long-Wave UV) | Inert to bright blue or blue-greenHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Thermoluminescence | RedMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Crystallography of Danburite |
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| Crystal System | OrthorhombicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Habit | Prismatic with rhombohedral to square cross-sectionMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Geological Environment |
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| Where found: | Danburite occurs in granites and in metamorphosed carbonate rocks associated with hydrothermal activityMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Inclusions in Danburite |
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| "Fingerprints", parallel growth tubes (may create chatoyancy) - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4 |
| Further Information |
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| Mineral information: | Danburite information at mindat.org |
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| Significant Gem Localities |
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| Japan | | |
| Gemstones, Arthur Thomas, 2009, p.116 | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 403 | | Mexico | | |
| Gemstones, Arthur Thomas, 2009, p.116 | | Myanmar | |
- Dattaw-taung (Dattaw hill)
| 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 |
- Pein-Pyit (Painpyit; Pyan Pyit)
| 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 |
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