| General Information |
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| A variety or type of: | Peridot |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Synthetic Forsterite |
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| Synthetic forsterite: Colour - blue; Transparent; Hardness 7; RI 1.635 - 1.670; Birefringence 0.035; Biaxial/+; SG 3.26; Pleochroism: violet - blue - purple; Orthorhombic; Inclusions: gas bubbles; Fluorescence: LW - chalky white, SW - greenish-yellow. - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 16 |
| Physical Properties of Forsterite |
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| Mohs Hardness | 6.5 to 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Specific Gravity | 3.23 to 3.26Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Optical Properties of Forsterite |
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| Refractive Index | 1.635 to 1.671Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Optical Character | Biaxial/+Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Birefringence | 0.034 to 0.035Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Colour |
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| Colour (General) | Colorless to greenishHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Colour (Chelsea Filter) | NeutralHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Fluorescence & other light emissions |
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| Fluorescence (Short Wave UV) | Inert to weak greenish yellowHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Fluorescence (Long-Wave UV) | Inert to chalky orangyHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Crystallography of Forsterite |
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| Crystal System | OrthorhombicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Further Information |
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| Mineral information: | Forsterite information at mindat.org |
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| Significant Gem Localities |
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