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Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn2+,Y)ZrSi8O22(OH,Cl)2) NS2843 |
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| Crystal system | hexagonal. |
| Habit | thin or thick tabular , hexagonal, rhombohedral or trigonal and often short to long prisms. |
| Cleavage | indistinct. |
| Fracture | uneven. |
| Hardness | 5-5.5 |
| Specific Gravity | 2.9-3.0 |
| Color | various shades of yellowish brown, brownish red, pink and red. |
| Luster | transparent to translucent with a vitreous greasy or dull luster. |
| Streak | none. |
| Distinguishing features | when heated with a gas flame, it fuses into a shiny green glass. |
| Uses | of interest to collectors and researchers. |
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