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Villiaumite (NaF) NS0915F |
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| Crystal system | isometric. |
| Habit | massive or in fragments; in crystal form it is cubic or octahedral. |
| Cleavage | perfect. |
| Fracture | none. |
| Hardness | 2-2.5 |
| Specific Gravity | 2.8 |
| Color | pale orange to deep red. |
| Luster | varies from vitreous to waxy or frosty. |
| Streak | white. |
| Distinguishing features | displays weak red fluorescence under ultraviolet radiation. |
| Uses | gemstones of up to 12.10 carats have been cut from villiaumite from Mont Saint-Hilaire. |
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