If you want to check the sample out try the following.
(1) The flow chart test (refer attachment).
(2) If it meets the criteria
Send your image to
korotev@wustl.edu (Randy L Korotev Department of Earth and Planetary Sciences Washington University)
If you are willing to spend a bit of money send the sample to an analytical lab to do an XRF (x-ray fluorescence) test to measure the amount of nickel in the sample. The advantage with the test is that it is non destructive. The nickel content in all type of meteorites is around 4-30%.
Earth rocks by comparison even if classified as nickel ore is no more than 1.8%.
Regards
Steven