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Elpidite (Na2ZrSi6O15·3H2O) NS2858.02 |
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| Crystal system | orthorhombic. |
| Habit | vertically striated prismatic crystals. |
| Cleavage | perfect. |
| Fracture | splintery. |
| Hardness | 5 |
| Specific Gravity | 2.5 |
| Color | colorless, yellow/white, or if it contains impurities it can be light red. |
| Luster | transparent with a silky or vitreous luster. |
| Streak | none. |
| Distinguishing features | its prismatic needles have a tendency to diverge from one point |
| Uses | of interest to collectors and researchers. |
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