| 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 Gahnospinel |
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| Mohs Hardness | 7.5 to 8Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Specific Gravity | 3.65 to 4.55Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references |
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| Optical Properties of Gahnospinel |
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| Refractive Index | 1.735 to 1.790Herve 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) | Blue, bluish-violet, violetUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Causes of Colour | Blue, Fe2+ in tetrahedral coordinationW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) |
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| Transparency | TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Crystallography of Gahnospinel |
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| Crystal System | IsometricHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Further Information |
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| Mineral information: | Gahnospinel information at mindat.org |
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| Significant Gem Localities |
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