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Narsarsukite (Na2(Ti,Fe3+)Si4(O,F)11) NS4328A      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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