Lots of bags of dry beans have rocks. Little black pebbles usually, like coarse sand.

Some brands have them more often than others but you can easily break a tooth on them so I always toss them on the counter and scoot them around to check.

I've found lots of rocks in bags of beans over the years, could be a regional or economic thing too (just as a point of reference, I grew up really poor in the South). As a kid I remember pouring them out on a backing sheet to sort them, little did I realize I'd end up doing something similar as a teen with an AOL CD tin.

"15 bean soup is great but you gotta check the packet for rocks" is the most American thing I've read today.

Most agricultural products go through screening to remove unwanted materials, but these systems can miss items that closely resemble the food in size and appearance. For example, I once bit into a rock that looked exactly like an almond in a bag of almonds. While it's a rare occurrence, it's still important to stay cautious. If something like this happens, contact the company and provide the product’s serial or lot number. This helps them trace where and when it was packaged and check if there was a problem with the screening process.