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Serandite (Na(Mn2+,Ca)2Si3O8(OH)) NS3731B.01 |
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| Crystal system | triclinic. |
| Habit | ranges from acicular, to blocky, to bladed and rarely in fibrous aggregates; is usually prismatic and often twinned. |
| Cleavage | perfect. |
| Fracture | uneven. |
| Hardness | |
| Specific Gravity | 3.32 |
| Color | pale pink, salmon red, rose red, deep orange, brown or black; rarely colorless, tan or white. |
| Luster | translucent to opaque and is vitreous or greasy to dull. |
| Streak | none. |
| Distinguishing features | orange/red color and blocky appearance. |
| Uses | of interest to scientists and collectors. |
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