I knoooww!! The greatest prop-geek honor!
Soo cool!!!
And so a quick update: I wasn't 100% satisfied with how things were turning out and kept thinking of how to get rid of the little dime-shaped flecks and get cracks instead.
It may totally backfire as it's still curing... but about 7 minutes and then 15 minutes into the cure I stabbed the ever-loving hell out of it from the inside out with a box-cutter.
I pulled it out of the mold on the 2nd "stabbing" and could see from the inside where the blade was going. It was pretty awesome! It looked similar to when the scientist in Jurassic Park drills into the amber.
The Stone while it is curing is HOT AF so I had to handle it quickly but it did indeed create beautiful planer cracks like the prop pictured here:
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I suspect you can see in these specific stones where the hollow inside it is where they placed the light. Since it was obviously an incandescent bulb It was probably decently sized and (in theory) accounts for the 2nd sort of foggy hollow inside this dome that makes it look scooped-out.
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Will post more pics soon!