| General Information |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Synthetic Periclase |
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| Synthetic periclase: MgO; Cubic; Green, colourless, transparent; Hardness 6; RI 1.738; Isotropic; SG 3.75; Cleavage perfect - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 24 |
| Physical Properties of Periclase |
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| Mohs Hardness | 6Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 3.61Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Cleavage Quality | PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Optical Properties of Periclase |
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| Refractive Index | 1.735 to 1.738Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Optical Character | IsotropicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Colour |
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| Colour (General) | Orange-yellowishUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Transparency | TranslucentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Lustre | VitreousAnthony et al, Handbook of Mineralogy (2001) |
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| Fluorescence & other light emissions |
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| Fluorescence (General) | Inert to whitishHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Crystallography of Periclase |
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| Crystal System | IsometricHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Habit | Masses or small octahedra and other formsMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Geological Environment |
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| Where found: | A product of the high-temperature metamorphism of magnesian limestones and dolostone.Anthony et al, Handbook of Mineralogy (2001) |
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| Further Information |
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| Mineral information: | Periclase information at mindat.org |
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