Gemmological formulas

Card Set Information

Author:
katkoutakis
ID:
64684
Filename:
Gemmological formulas
Updated:
2011-02-07 16:02:40
Tags:
Emerald
Folders:

Description:
Green variety of beryl
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user katkoutakis on FreezingBlue Flashcards. What would you like to do?


  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

What would you like to do?

Home > Flashcards > Print Preview