No problem, James, if the pieces are too small to rub you can follow an alternative procedure: pulverize some pieces to obtain approx. 1 or 2 grams of powder, put it in a glass test-tube or anything similar. Add slowly the acid solution (Nitric acid or Hydrochloric acid 1% aq. solution) to solve the powder. Then add ammonium hydroxide solution (10%) to make alcaline. In case Iron is present you will see a brown-yellowish precipitate which is mainly composed of Iron hydroxide. After filtering add some droplets of a DMG solution (1%in alcohol) to the filtrate: if meteorite material is present you will see a reddish colored precipitate.