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Arfvedsonite (Na2-3(Fe2+,Mg,Al)5Si8O22(OH,F)2) NS2798B.02 |
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| Crystal system | monoclinic. |
| Habit | prismatic and often tabular. |
| Cleavage | perfect. |
| Fracture | uneven. |
| Hardness | 6 |
| Specific Gravity | 3.5 |
| Color | green/black to black. |
| Luster | opaque with a vitreous luster. |
| Streak | dark blue/gray streak. |
| Distinguishing features | fuses easily to a magnetic black glass. |
| Uses | of interest to collectors and researchers. |
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