Lots of possibilities for the first; it's tough here to see the play of light on it.
The second I'd guess is most likely quartz (lots of other possibilities too) with inclusions on the other side which almost certainly include pyrite and the black stone could be galena or hematite perhaps; again, quite a few possibilities.
The third most reminds me of a zeolite cluster. The zeolites, like apophyliite, stilbite etc are used in mining to clean as they have spaces in their geometry which can sequester minerals and pull them out of, say, a solution.