From The Gemology Project
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Chemical composition NaCa2Si3O8(OH)
Crystal system edit me
Habit edit me
Cleavage edit me
Fracture edit me
Hardness 5
Optic nature edit me
Refraction index 1.59 - 1.63
Birefringence edit me
Dispersion edit me
Specific gravity 2.62 - 2.87
Lustre edit me
Pleochroism edit me