For those of you that enjoy searching out optic figures with your polariscope, the link below will show you some advanced or at least different techniques using equipment that may be more familiar to the petrologist.
I believe Doos has been researching the use of wave plates and quartz wedge for determining optic sign.
Here's one more with a simple explaination of interference figures. I know you had a chat on this at one time but pictures and diagrams are always helpful.
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