can someone ID these?

[uberlapis]

I live in PA these are found along a river that has thick sandy blue/green clay about 8 inches down.
Are these a normal rock found, and are they maybe lightning making natural glass of the green sand?
Thanks a lot!
HH
Uber

 

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[uberlapis]

here is more pics. of same rocks i can't get the lighting in here right for the pics.

HH
Uber

 

[ZumbroKid]

try a local rock shop.

 

[dano91]

I'm seeing a layer of white chaulk which says Marcasite.
Nice finds!!!

 

[Nana40]

Hey ub... i found this site....it has lots of pics to compare your rocks to...

http://skywalker.cochise.edu/wellerr/aawellerweb.htm

Nana