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Mangan-neptunite (KNa2Li(Mn2+,Fe2+)2Ti2Si8O24) D04316 |
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| Crystal system | monoclinic. |
| Habit | well formed, elongated prisms or equant pseudorhombohedra; commonly twinned. |
| Cleavage | perfect. |
| Fracture | conchoidal. |
| Hardness | 5-6 |
| Specific Gravity | 3.23 |
| Color | ranges from reddish brown to orange and black. |
| Luster | vitreous to waxy or dull on external surfaces and resinous on internal surfaces (i.e. after fracturing the specimen. |
| Streak | |
| Distinguishing features | color zoning is often present and this depends on how much Mn there is compared to Fe. |
| Uses | of interest to collectors and researchers. |
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