| General Information |
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| Chemical Formula | Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Physical Properties of Villiaumite |
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| Mohs Hardness | 2Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Specific Gravity | 2.79Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | DistinctUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Optical Properties of Villiaumite |
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| Refractive Index | 1.328 to 1.332Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Optical Character | IsotropicUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Pleochroism | Yellow to pink/deep carmineMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Colour |
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| Colour (General) | RedUlrich 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 | VitreousAnthony et al, Handbook of mineralogy (2001) |
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| Fluorescence & other light emissions |
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| Fluorescence (General) | Dark red to orange and yellow fluorescence under SW and LW UVAnthony et al, Handbook of mineralogy (2001) |
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| Fluorescence (Short Wave UV) | May show weak red fluorescenceMichael O’Donoghue, Gems, Sixth Edition (2006) |
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| Crystallography of Villiaumite |
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| Crystal System | IsometricUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references |
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| Habit | Granular massesMichael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Geological Environment |
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| Where found: | Villiaumite occurs in nepheline syenite and nepheline syenite pegmatites.Michael O’Donoghue, Gems, Sixth Edition (2006) More from other references |
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| Further Information |
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| Mineral information: | Villiaumite information at mindat.org |
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| Significant Gem Localities |
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| Guinea | |
- Los Archipelago (Los Islands)
| Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 464 |
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