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Narsarsukite (Na2(Ti,Fe3+)Si4(O,F)11) NS4327A |
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![Image: NS4327A.jpg](../minerals_jpg/NS4327A.jpg) |
![Detail: NS4327Adetail.jpg](../minerals_jpg/NS4327Adetail.jpg) |
Crystal system |
tetragonal. |
Habit |
tabular growth. Rarer forms are elongated tetragonal prisms. |
Cleavage |
perfect. |
Fracture |
uneven. |
Hardness |
6-7 |
Specific Gravity |
2.78 |
Color |
has a great variety; pale to dark yellow, greenish yellow, dark green, grayish brown to dark brown, colorless, pale pink, lemon yellow to orange-yellow and can often show a zoning of colors. |
Luster |
vitreous to dull or greasy and is transparent to translucent. |
Streak |
none. |
Distinguishing features |
most tabular crystals are opaque and typically color zoned with a yellow center progressing to a green outer edge. |
Uses |
of interest to scientists and collectors.
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