Silver?

Sometimes jewelers can tell if you have silver in bullion form...

One way would be to determine volume and mass (weight) of the metal you have to see of it is close to the density of silver.

If you google "silver testing kit", you'll discover millions of people ready to sell you some fancy chemical kit or techno-widget that'll test for silver. Most of these kits work on the same principle as the jeweller's touchstone, so unless you're planning to do lots of precious metal testing or you're out in the middle of nowhere, taking the object to a jeweller is probably the easiest thing to do.

If you want to test it yourself, don't want to fork over the big bucks for a "testing kit" and have access to a chemical supply store, this old thread has the recipe. Note that both the off-the-shelf kits and the homemade brew contain some nasty chemicals; you don't want to get any on you.

This really, really old thread on the subject might also be of interest to you.