| General Information |
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| A variety or type of: | Andalusite |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth edition (2006) |
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| Physical Properties of Chiastolite |
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| Mohs Hardness | 7.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Specific Gravity | 3.00 to 3.15Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Cleavage Quality | DistinctUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Properties of Chiastolite |
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| Refractive Index | 1.627 to 1.645Herve 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 | 0.007 to 0.013Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Colour |
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| Colour (General) | Dark cross-like patternHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Transparency | Translucent,OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Lustre | VitreousArthur Thomas, Gemstones (2009) |
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| Crystallography of Chiastolite |
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| Crystal System | OrthorhombicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) |
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| Habit | Square prismsArthur Thomas, Gemstones (2009) |
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| Further Information |
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| Mineral information: | Chiastolite information at mindat.org |
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| Significant Gem Localities |
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| Australia | |
- Bimbowrie Conservation Park
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 381 | | USA | | |
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 382 |
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