Can anyone tell me what this rock is?

[G Freeman]

Saw a friend of mine yesterday and he had this rock he showed me that weighs at least 30 lbs. So I put it on here to ask my friends if they had any idea what it is with the color it is. Thanks all.
Photos not that good but I only had time to take 2 pictures of it before he left.

 

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[kingskid1611]

Looks like a large piece of coal but that can't be it.. Interesting enough I would have brought it home.

 

[Kray Gelder]

Looks like a peace of glass slag, he should use a piece of quartz to scratch it. It is nice looking anyhow.

What, it's not a diamond? Sure looks like one. How can you ID from a picture?

 

[Kray Gelder]

Big chunk of glass.

 

[smokeythecat]

It's a big chuck on colored glass. They are very popular. A lot of people use them for garden decoration.

 

[Moesia]

What, it's not a diamond? Sure looks like one. How can you ID from a picture?

I try to help people out here when i can, you are here to quarrel it seems.

 

[Ponchosportal]

Glass/Slag