Just a reminder to check the first and last doses from a bag of coffee that you buy. Foreign material usually either floats to the top of a bag, or sinks to the bottom.

This is especially for coffee from a smaller roasting company that may not use a destoner, magnets, colour sorter, and/or other means to clean up coffee after roasting.

The little bit of concrete in the pic was probably from a drying patio. This coffee was from the bottom of a 1kg bag from a roaster who does use a colour sorter post-roast. Nothing is perfect.

Good to be on the lookout for those, since they can ruin your burrs.

I found this in my coffee a few months ago. It wasn't a stone but it was hard enough to abruptly halt my hand grinder. It was a similar size, density, and color as the beans so it's understandable that it made it through Q/C. I wonder what it was?

Looks like charred Bonbon.

Good reminder to check for stones and debris. Over the past decade of buying roasted coffee, it's only happened to me twice. Fortunately, I noticed them before they went in the grinder. I don't think I would have noticed the object that jpender found, though.

Don't know for sure, but if it came in a bag of Luwak coffee, it could be a constipated bit of civet excreta.

I too almost threw one into the grinder without noticing: