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Magnesioriebeckite

- Formula
- [box]Na2(Mg3Fe3+2)Si8O22(OH)2
- Crystal System
- Monoclinic
- Crystal Habit
- Acicular, Prismatic
- Cleavage
- Perfect, None, None
- Luster
- Vitreous - Silky
- Color
- light blue, dark blue, black, black blue
- Streak
- blue gray
- Class
- Monoclinic - Prismatic
- Fracture
- Brittle - Uneven
- Hardness
- 5
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Magnesioriebeckite from Franklin, Sussex Co., New Jersey, United States

Cabinet specimen with "veins" of felted, fibrous bluish Magnesioriebeckite.
Click thumbnail images for larger view.