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Rob Potter of Johnson Matthey has seen it, and they have tested it for other minerals, and there are no additives or modifiers. The background clear glass is pure SiO2, as is LDG, which noone doubts is of impact origin. True, silica glass can be made synthetically, but needs ovens that go above 1600C, and a very good reason to do so. Plus the holes in the tubes must be natural.

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Hongshan Skulls - glass and other 2159 drdavidanderson 23-Feb-18 14:26
Re: Hongshan Skulls - glass and other 408 Andrew_W 25-Feb-18 05:58
Re: Hongshan Skulls - glass and other 393 drdavidanderson 25-Feb-18 11:19
Re: Hongshan Skulls - glass and other 376 JFG 28-Feb-18 16:17
Re: Hongshan Skulls - glass and other 393 JFG 27-Feb-18 02:05
Re: Hongshan Skulls - glass and other 406 drdavidanderson 27-Feb-18 08:07
Re: Hongshan Skulls - glass and other 378 JFG 28-Feb-18 16:01
Re: Hongshan Skulls - glass and other 716 drdavidanderson 28-Feb-18 16:44


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