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Astrophyllite ((K,Na)3(Fe2+,Mn)7Ti2Si8O24(O,OH)7) NS4322 |
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![Image: NS4322.jpg](../minerals_jpg/NS4322.jpg) |
![Detail: NS4322detail.jpg](../minerals_jpg/NS4322detail.jpg) |
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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