Hi @denmarkguy , while I was stationed in Lompoc Cali at Vandeberg AFB I spent quite a lot of my free time on the local "clothing optional beach" so I wasn't exactly looking down at the pebbles and sand, if you get my meaning.
I did find quite a few unusual (to me) rocks and oddities, can't say as I ever noticed any glass such as you mention here. It is fascinating though. I wish there were more of that and less plastic now.

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