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One thing that would determine the difference in a minute is a portable XRF spectrometer. And if this inquiry had come up last year I might have been able to help but I am now on the scrapheap - a victim of the government's abandonment of the Tertiary education sector.
Portable XRF is a common tool in geology/earth science departments and in the mineral exploration industry. I don't know who else uses them. I'm not sure how well it will detect boron (it doesn't like light elements) but the borosilicate glass also contains Al which it will detect.
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