Glass in oil filter?

[Lobo1186]

So i changed my oil today and when i cut open my filter there were what seemed to me little pieces of brown glass in the filter.

Now Im not saying that is what it actually was... but it was transparent, brown and fairly sharp like little glass shards. anyone got any ideas? i know it sounds a lil wild but im just calling it as I see it. I would have taken some pics but really it wouldnt have helped cuz it would have just shown small brown specs.