| General Information |
|---|
| A variety or type of: | Spinel |
|---|
| Chemical Formula | Gemdat.org, Management Team (2012) |
|---|
| Physical Properties of Pleonaste |
|---|
| Mohs Hardness | 8Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
|---|
| Specific Gravity | 3.80Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
|---|
| Cleavage Quality | NoneMichael O’Donoghue, Gems, Sixth Edition (2006) |
|---|
| Optical Properties of Pleonaste |
|---|
| Refractive Index | 1.780Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
|---|
| Optical Character | IsotropicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
|---|
| Colour |
|---|
| Colour (General) | BlackUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
|---|
| Transparency | OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
|---|
| Lustre | VitreousArthur Thomas, Gemstones (2009) |
|---|
| Crystallography of Pleonaste |
|---|
| Crystal System | IsometricHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
|---|
| Habit | Octahedra though some specimens may show dodecahedron or cube faces.Michael O’Donoghue, Gems, Sixth Edition (2006) |
|---|
| Further Information |
|---|
| Mineral information: | Pleonaste information at mindat.org |
|---|
| Significant Gem Localities |
|---|
| Madagascar | | |
| Pezzotta (1999) | | Sri Lanka | | |
| | | Thailand | | |
| |
|
|
