GeologyRocks

This looks like compression to me. Am I right? 

 Rock 1 : This appears to be an grainy brown rock with tints of dark green, probably containing measureable amounts of silicon dioxide. There appears to be a few clasts or perhaps porphyroclast of unknown material in a few places. Since I'm not familiar with the origin of this rock, I am going to guess that it is possibly some metamorphic form of  Leaverite (http://en.wikipedia.org/wiki/Leaverite). In all seriousness, I don't know what Rock 1 is.  I was just being silly.

 Rock 2 : Appears to be a piece of granite with quartz.

 Rock 3 : Chunk of quartz.

 Rock 4 :  I agree. This appears to be metamorphosed sandstone (quartzite).

Disclaimer : I'm not a geologist, just an amateur rock enthusiast, and prospector wannabe. Please wait for comments from others who have more knowledge in these things.

I guess it is quartz too. It is a very common mineral to be found on Earth!

Rock 1: There is some small rocks, quartz (the mineral in rock 2,3) and maybe sand (i am not sure) on the rock. The surface of this rock feels quite sandy and rocky. If you ask me for a guess, I will say it is a granite... Do tell me if I am wrong.