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Pectolite (NaCa2Si3O8(OH)) NS2691 |
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| Crystal system | triclinic. |
| Habit | fibrous and radiating spherical aggregates in compact masses; acicular, elongate crystals also possible. |
| Cleavage | perfect. |
| Fracture | splintery. |
| Hardness | 5 |
| Specific Gravity | 2.89 |
| Color | colorless, white or gray. |
| Luster | transparent with vitreous or silky luster. |
| Streak | white. |
| Distinguishing features | two directions on the crystal have perfect cleavage; and acicular fragments that can puncture the skin. |
| Uses | of interest to scientists and collectors. |
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