Template:Ammolite

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Ammolite
Chemical composition CaC03 with trace elements
Crystal system Orthorhombic
Habit Fractured and non-fractured flat layers
Fracture Parting along layers
Hardness 3.5
Refractive index 1.525 - 1.670
Birefringence 0.135 - 0.145
Specific gravity 2.60 - 2.85
Lustre Vitreous to resinous