The information should at least say what the specimen is and where it came from. If you don't know the name of the rock and would like to get it identified, the location can be a very important clue in determining what kind of rock or mineral it really is. Making your labels Your computer can serve you well in making your labels. You might want to print up some labels with blanks that you can fill in by hand. If there is a chance the label might get separated from the rock, write a brief description of the specimen on your label.
Some collectors put a white dot on each sample and give it a code number corresponding to the label.
A line drawn around the label gives it a nice finished appearance. Be careful of making the label too ornamental, because you want the specimen to receive the attention, not the labels. If your printer can handle a heavy weight paper, you will have less of a problem with humidity causing the labels to curl. For a display you may be taking to a show, think about gluing the labels onto some heavier cardboard or matt board, so they stand up or lay down properly. Keep the label in the box with the specimen in a way that the labels won't get mixed up with other specimens.