Found in my bed, sold chalk like bits, looks to have been cylinder shaped. No smell from what I can tell and crumbles easily.

Found in my bed, sold chalk like bits, looks to have been cylinder shaped. No smell from what I can tell and crumbles easily.
Answer: This is rat bait. The green color is distinctive…(its not children’s chalk!) I have used it, so I know. It looks to have been partially eaten, too, hopefully by vermin? This plastic cannister is what they are supposed to stay inside of, but occasionally pieces of it will get dragged out. It contains a powerful anti-coagulant (blood thinner) by which mechanism it kills mice and rats.
Keep this away from your pets, it can and will kill them.