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Astrophyllite ((K,Na)3(Fe2+,Mn)7Ti2Si8O24(O,OH)7) NS4324B |
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| Crystal system | triclinic. |
| Habit | crystals bladed often in star-like looking groups. |
| Cleavage | perfect to poor depending on its orientation. |
| Fracture | none. |
| Hardness | 3 |
| Specific Gravity | 3.3-3.4 |
| Color | black, medium to dark brown, reddish bronze or brownish red. |
| Luster | opaque metallic, greasy or pearly luster. |
| Streak | black. |
| Distinguishing features | care must be taken to not confuse this mineral with its almost identical cousin kupletskite; the stellate (star-like) growth pattern is typical. |
| Uses | of interest to collectors and researchers. |
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