Dear Andy,
I can't think immediately offhand of any silica being used in explosives.
It certainly was looked for, but, since it was so readily available it never
featured prominently.
The Imperial War Museum might be a good place to start, and to check for
explosives, Nobel and ICI Expl.Depts. keep archive material so they would
know - it does take time for a reply from them though.
Regards, Bernard.
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