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Mini-Quiz for October 1st Newsletter


#1

You are looking at a red gem in the polariscope and see fine lines crossed at 90 degrees. You are probably looking at:

a) A singly refractive gem
b) A synthetic gem
c) Silk inclusions


#2

I should say : most probably a synthetic gem


#3

b. a synthetic gem - the lines indicates internal strain.


#4

silk inclusions


#5

) A synthetic gem