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Nephaline ((Na,K)AlSiO4) NS2882 |
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| Crystal system | hexagonal. |
| Habit | hexagonal or prismatic crystals with pinacoid terminations. |
| Cleavage | poor. |
| Fracture | subconchoidal. |
| Hardness | 5.5-6 |
| Specific Gravity | 2.56-2.66 |
| Color | white, yellow, gray, green or red. |
| Luster | transparent with a vitreous or greasy luster. |
| Streak | white. |
| Distinguishing features | typically has a greasy luster and is distinguished from quartz by its lower hardness. |
| Uses | used in glass, china, rubber, textile and oil industries. |
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