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 Post subject: Bubble and Octahedral Crystal together
PostPosted: Thu Mar 08, 2018 4:40 am 
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I have a ruby and assume it is glass-filled because there is a bubble. But beside it is a perfect octahedral crystal. Any ideas? Also, not sure what the black inclusions are. The black clusters I usually see are from Madagascan origin but they are more elongated and these aren’t. I’ve seen the same black inclusions in my low temp lead glass-filled study stone (with hex pattern intact) but this stone doesn’t have the blue flash effect that I typically see in glass-filled. Also has surface-reaching fractures.


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 Post subject: Re: Bubble and Octahedral Crystal together
PostPosted: Fri Mar 09, 2018 10:49 pm 
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You will sometimes get CO2 gas bubbles in corundums. Looking closer you may also find that they can be 2 phase gas/liquid.
Could be remnants of flux in heat treatment.
Blue flash is rather diagnostic with glass.

PS. Remember 600px width with uploaded photos. 8)


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 Post subject: Re: Bubble and Octahedral Crystal together
PostPosted: Sat Mar 10, 2018 4:46 am 
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Thanks, Barbra!
One the first photo, I’m actually trying to see if the inclusion there is liquid but the bubble seem not to move.


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