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What is the chemical formula of emerald?
What is the crystal system of emerald
What is the SG of emerald?
2.76 on average
What is the refractive index of emerald?
What is the birefringence factor of emerald?
- nω = 1.564–1.595
- nε = 1.568–1.602
δ = 0.0040–0.0070
Definition of Acicular
Needle-like crystal habit