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We have found two small, unrelated rocks in our garden both of which are mysterious.
One is long, round, thin and has a hole in one end to about half-way through and appears crystalline, brownish and pimpled.
The other is spherical, lumpy and has 3 dots of rock on the top as well as a polished feel (fossilized sea urchin?).
I see no one's had a chance to reply to your post yet. I'm afraid I don't know much about identifying rocks, but until someone can identify your specimen, the Earthlab datasite might be of use: http://www.nhm.ac.uk/jdsml/nature-online/earthlab/
And, if you are interested in them in general, you might want to visit the Earth Lab gallery in the museum.
Hopefully someone will be along to tell you what the rocks are soon!