hmmmmm don't know what it is.....

i am not sure what this is......it was always in my moms fish tank when we were kids~ its a good 6 lbs if not more~i am thinking a big hunk of molten glass?? about 7" across and 6" high-i love all the shades of red in it~i use it for a book end now~i have no idea of where or who to take it to~to find out what it is~wouldn't it be something if its a huge uncut RUBY~and its has sat in a fish tank and on a book shelf for more than 45 years!!!! i just find it really cool-and great to hold~