Commonwealth legislation applies only to the export of meteorites, under the 'Protection of Movable Cultural Heritage Act" -
http://www.meteorites.com.au/found/law.html
Not sure about all the State laws, but in the Northern Territory at least, it is illegal to collect meteorites or tektites off the ground, under their "Meteorites Act". All such objects belong to the NT government. Mind you, they also step away from any liability for loss/damage caused by a meteorite! Link here:
http://notes.nt.gov.au/dcm/legislat/legislat.nsf/d989974724db65b1482561cf0017cbd2/0196cfb748e5fa7b69256921007d6960?Op enDocument
So check relevant State laws....
Cheers -