Gemmological formulas

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  1. What is the chemical formula of emerald?
    Be3Al2(SiO3)6
  2. What is the crystal system of emerald
    Hexagonal
  3. What is the SG of emerald?
    2.76 on average
  4. 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
  5. Definition of Acicular
    Needle-like crystal habit
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ID
64684
Card Set
Gemmological formulas
Description
Green variety of beryl
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