| General Information |
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| A variety or type of: | Zircon |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) |
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| Physical Properties of Hyacinth |
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| Mohs Hardness | 6.5 to 7.5Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Specific Gravity | 3.93 to 4.73Walter Schumann, Gemstones of the world (2001) |
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| Tenacity | BrittleHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Cleavage Quality | IndistinctWalter Schumann, Gemstones of the world (2001) |
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| Fracture | ConchoidalArthur Thomas, Gemstones (2009) |
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| Optical Properties of Hyacinth |
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| Refractive Index | 1.810 to 2.024Walter Schumann, Gemstones of the world (2001) |
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| Dispersion | 0.039Walter Schumann, Gemstones of the world (2001) |
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| Colour |
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| Colour (General) | Yellow, yellow-red, yellow-brownManagement Team, Gemdat.org (2012) |
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| Transparency | Transparent,TranslucentArthur Thomas, Gemstones (2009) |
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| Further Information |
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| Mineral information: | Hyacinth information at mindat.org |
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| Significant Gem Localities |
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