The black and white one is, roughly speaking, a granite.
The white minerals will be quartz and feldspars (there are multiple types); the dark mineral(s) will be a dark mica called biotite and/or an amphibole such as hornblende and/or other minerals.
The other one is probably a garnet mica schist; I can't be sure of the schist part without seeing photos of other sides (where I'd be looking for a metamorhpic foliation called schistosity). The chemistry in terms of elements is probably not much different from the granite, but this is a metamorphic rock - one that has been affected by heat and pressure. That made some of the original minerals change to different ones - the new ones being stable in the altered physical conditions. One of those minerals is garnet. The reddish-purple lumps you see are crystals of garnet, probably one called almandine; you'll see a nice example in the the photo here - http://en.wikipedia.org/wiki/Almandine. The black shiny specs will be biotie.