You can get a few more clues by finding out if it is magnetic, measure
its specific gravity, see what kind of sparks it generates when
pressed against a grinding wheel. These are all pretty easy to do.
I dont recall from the original post what shape your metal is, but if you can
gewt a small piece, say a cubic inch you can imerse it in water ion a measuring
(if thats the correct term) and notice how mych the water rises. That will give
you the volume of the sample. the you weigh the sample and divide the two
Weight divided by volume. the number youi get is the specific gravity.
Specific gravity is the ratio of the weight of the metal to an equal
volume of water. Lots of ways to do that. One way is to fill a
container to the top with water. Then put the object in the water and
catch the water that spills out of the container. Then weight the
object and the spilled water and divide.
Other methods may be easier or less messy for example if you have a
graduated container the object will fit into.
Maybe the first question is "Why do you want to know?". What do you
plan to do with it or use it for that requires specific knowledge?
How much of it do you have?
Some simple things to do are to weigh it and note the volume, then
compare the weight per cubic inch to a chart of known materials. What
shape is it? What does it do when left wet and exposed to air. How
well does it conduct heat? What happens when you add significant
heat, as in burning or melting it, and at what temperature colour?
What happens when you try to grind it?
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