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