Bowenite

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Bowenite (Serpentine)
Chemical composition Mg6((OH)8)Si4O10)
Crystal system Mostly monoclinic
Habit Cryptocrystalline
Cleavage None
Fracture Even to hackly
Hardness 2-5.5
Optic nature None
Refractive index ±1.55
Birefringence None
Dispersion None
Specific gravity 2.59
Lustre Waxy
Pleochroism None