Hi Marouane,
I have been able to find that your name means 'rock', 'quartz', or 'solid stone' in Arabic.
I found my info here:
http://www.first-names-meanings.com/names/name-MAROUANE.html and here:
http://en.wikipedia.org/wiki/Marwan
And just in case you aren't familiar with it, this is what quartz is:
http://en.wikipedia.org/wiki/Quartz
Hope this helps! :)