| General Information |
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| Other Names/Trade Names: | |
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| Physical Properties of Nuummite |
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| Mohs Hardness | 5 to 5.5Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 3.18 to 3.37Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Cleavage Quality | PerfectUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Properties of Nuummite |
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| Refractive Index | 1.635 to 1.663Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Optical Character | Biaxial/-Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Birefringence | 0.022Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Colour |
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| Colour (General) | Dark gray, brownish-black. Blue, golden yellow and reddish iridescenceUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Transparency | OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Crystallography of Nuummite |
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| Crystal System | OrthorhombicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) |
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| Further Information |
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| Mineral information: | Nuummite information at mindat.org |
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