General Information |
---|
Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
---|
Danburite Treatments |
---|
A pink color has been noted to form on irradiation (C.L. Key, unpublished observation).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 |
---|
Mohs Hardness | 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
---|
Specific Gravity | 2.97 to 3.03Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
---|
Cleavage Quality | ImperfectWalter Schumann, Gemstones of the world (2001) More from other references |
---|
Fracture | Uneven,ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references |
---|
Optical Properties of Danburite |
---|
Refractive Index | 1.627 to 1.639Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
---|
Optical Character | Biaxial/+,-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
---|
Birefringence | 0.006Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
---|
Pleochroism | Weak: pale yellow - yellowHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
---|
Dispersion | 0.017Arthur Thomas, Gemstones (2009) |
---|
Colour |
---|
Colour (General) | Yellow, yellow-brown, brown, pink, colourlessUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
---|
Transparency | TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
---|
Lustre | VitreousArthur Thomas, Gemstones (2009) |
---|
Fluorescence & other light emissions |
---|
Fluorescence (Short Wave UV) | Weaker than LWHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
---|
Fluorescence (Long-Wave UV) | Inert to bright blue or blue-greenHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
---|
Thermoluminescence | RedMichael O’Donoghue, Gems, Sixth Edition (2006) |
---|
Crystallography of Danburite |
---|
Crystal System | OrthorhombicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
---|
Habit | Prismatic with rhombohedral to square cross-sectionMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
---|
Geological Environment |
---|
Where found: | Danburite occurs in granites and in metamorphosed carbonate rocks associated with hydrothermal activityMichael O’Donoghue, Gems, Sixth Edition (2006) |
---|
Inclusions in Danburite |
---|
"Fingerprints", parallel growth tubes (may create chatoyancy) - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4 |
Further Information |
---|
Mineral information: | Danburite information at mindat.org |
---|
Significant Gem Localities |
---|
| Japan | |
| Gemstones, Arthur Thomas, 2009, p.116 |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 403 | | Madagascar | |
| | | 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 | | USA | |
| |
| |
|
|