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I found this hard clay like rock on my stroll along beach it has a sandalwood /fishfood /leathery kind of smell it is really cool the smell has worn off a little as dry now. I wonder if it is ambergris???/
I think you could be right.
Break a bit off and put it into water in an old container suitable for heating on a stove.
Put a thermometer into the water (one that goes to at least 100C - not a medical one).
Heat the water and watch the temperature and the lump.
If it is ambergris, it should melt at about 62 °C to a fatty, yellow resinous liquid.
That should be a good enough test. But if you like, you could keep heating the water.
If it is ambergris, at 100 °C (that is, as the water boils) it should evaporate as a white vapour (best not to breathe it).
You could also try setting fire to a lump of it; it should burn with a luminous flame.
(temperatures from http://en.wikipedia.org/wiki/Ambergris)
You can also, more easily, test it as in the following page
Let us know!