I have a black rock size of the tennis ball but it is almost 2lbs heavy. What kind of stone is it?

Question

It is not magnetic

It is not magnetic. It is picked from Saskachevan, Canada where there is lots of uranium, is it maybe uranium?

It is to bad I cant add the picture to this text

Answer 1

It is a real good idea to see if it is magnetic. Iron is a very common element on Earth, so its a good bet (magnetite).
Something the size of a tennis ball with a weight of just under 2 lbs. has a density of over 5.5 and under 6.2 g/cc. Its black color indicates that it absorbs most visible light. Both of these pieces of information indicate that the rock contains a heavy metal element from the middle of the periodic table (The IB - VIIB Groups). (Assuming that the black is not just on the surface and that the rock is natural = not man-made). Most minerals are oxides or silicates (containing oxygen and silicon), but others, such as suflides, can also be found. Since most rocks undergo surface change when exposed to the weather, the black color (of the surface) may not tell you much.
Please keep in mind that some of the less common minerals (like Lead) can be poisonous (or radioactive) so you should wash your hands after touching the rock until you have identified it.
There are lots of sites to help: search yahoo "identifying rocks". One problem is rocks are not usually pure minerals so often even with a microscope, its hard to tell what exactly the rock is made up of.

If it isn't magnetic there are hundreds and hundreds of possibilities. If you really want to identify it, you'll have to learn more about rocks and minerals. If you don't want to spend the time to do that, take it to a rock shop or a meeting of "rock hounds" and ask for their help. Good luck!

Answer 2

Read in continuation with Dimwitdw's (he/she has given a very accurate answer !).
Is it a rock (an assemblage of minerals) or a single mineral ? Check whether it is homogeneous or not.
If it is a mineral, check whether its faces are conchoidal (curved, sharp ribbed) and streak is brownish black (u can determine by rubbing the mineral on the rough surface of a broken porcelain). If yes, it can be Uraninite or Pitchblende (in view of what u have added), which is an ore of uranium (UO2).
Dimwitdw is quite right - the possibilities are endless. You have to take it to the Geology Department of your nearest University and get a thin or polished section prepared for petrographic identification and also analyse the rock/mineral chemically to identify it. There is no short cut way to confirm.

Answer 3

Is it magnetic? It probably contains heavy metals such as iron and lead, the blackness sugests iron.

Answer 4

Maybe tungsten (is Swedish for heavy stone)

Th

Answer 5

Obsidian,volcanic glass