Emerald rough , from amature

Hi, I have this 40ct piece of emerald. Or so I think , I see the partial hexagonal shape as seen in photo. I was hauling out my stone polisher to polish the faces of the natural hexagon. Just to have a look.I do not want to destroy a good piece so i am sending this photo to get a take on what i have.
Thanks Bill

from a top down ,

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