What is this in my humidifier?

[poison]

I havent used my humidifier in a couple months and was about to set it up again but while cleaning it I noticed some stuff in it.

Any clue on what it is? It feels like broken glass but does not look like it.



This is the humidifier I'm using.

http://i.walmartimages.com/i/p/00/32...45_500X500.jpg