| General Information |
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| Chemical Formula | Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Physical Properties of Boracite |
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| Mohs Hardness | 7Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 2.90 to 3.00Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Tenacity | BrittleArthur Thomas, Gemstones (2009) |
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| Cleavage Quality | PoorArthur Thomas, Gemstones (2009) |
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| Fracture | ConchoidalArthur Thomas, Gemstones (2009) |
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| Optical Properties of Boracite |
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| Refractive Index | 1.658 to 1.673Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Optical Character | Biaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Birefringence | 0.010 to 0.011Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Pleochroism | NilArthur Thomas, Gemstones (2009) |
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| Dispersion | NilArthur Thomas, Gemstones (2009) |
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| Colour |
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| Colour (General) | Colourless, gray, greenUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Transparency | TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Lustre | Adamantine,VitreousMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Fluorescence & other light emissions |
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| Fluorescence (General) | Very weak greenish fluorescenceMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Crystallography of Boracite |
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| Crystal System | OrthorhombicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Habit | Pseudo-cubic, octahedrons, dodecahedrons, tetrahedronsArthur Thomas, Gemstones (2009) |
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| Further Information |
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| Mineral information: | Boracite information at mindat.org |
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