| General Information |
|---|
| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
|---|
| Physical Properties of Milarite |
|---|
| Mohs Hardness | 5.5 to 6Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
|---|
| Specific Gravity | 2.52 to 2.60Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
|---|
| Tenacity | BrittleArthur Thomas, Gemstones (2009) |
|---|
| Cleavage Quality | ImperfectArthur Thomas, Gemstones (2009) |
|---|
| Fracture | Uneven,ConchoidalArthur Thomas, Gemstones (2009) |
|---|
| Optical Properties of Milarite |
|---|
| Refractive Index | 1.537 to 1.560Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
|---|
| Optical Character | Uniaxial/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
|---|
| Birefringence | 0.000 to 0.011Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
|---|
| Colour |
|---|
| Colour (General) | Yellow, blueUlrich 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 (General) | Common weak to moderate chalky green (and phosphorescence)Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
|---|
| Crystallography of Milarite |
|---|
| Crystal System | HexagonalHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
|---|
| Habit | Prismatic crystals, typically well formedMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
|---|
| Geological Environment |
|---|
| Where found: | Milarite is found in vugs in granites and syenites or in hydrothermal veins.Michael O’Donoghue, Gems, Sixth Edition (2006) |
|---|
| Inclusions in Milarite |
|---|
| May show thin elongated thread-like inclusions - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7 |
| Further Information |
|---|
| Mineral information: | Milarite information at mindat.org |
|---|
| Significant Gem Localities |
|---|
| Brazil | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 430 |
|
|
