@guerrillarain@witches.town my received wisdom is hematite; when it's full of "bad energy," it breaks, which happens fairly quickly because hematite is pretty fragile. XD
but really anything would do; something you can hold in your hand, or put on a bracelet (or the bracelet itself), and then touch it and concentrate on putting the bad energy into it. and as soon as you get home stick it in a small bowl of salt, which is supposed to leach the bad energy back out.