Thanks to Matt and jjjnettie for your response to my query. The rock in question isn't magnetic and having looked at the meteor site you suggested, it doesn't seem to fit any of the categories listed. The area in which I found it is all granite, but this is the most 'un-granite-like' rock you're likely to find, in fact it looks like jet black quartz. I will send the details and some close-ups to the meteor site and let you know the results.
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