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A shaped piece of iron ore, probably used as ballast on H.M. Armed Vessel 'Bounty'. For online access text please see the 'Notebook' field within the 'Mail' icon.
Read more at http://collections.rmg.co.uk/collections/objects/63330.html#GsXYtXkSwYOHhMO9.99
Interestingly the Brit RN also used large lumps of Flint as ballast, here in Australia it can be found along our East coast beaches sometimes, although nowadays rounded into Sugar Loaf like configuration (probably from the tide and sand wear over a couple of hundred years). I've collected some of them and can provide images if anyones interested.