Looking To Identify This Crystal

[Shayden]

I work in water and sewer construction and while in the ditch we're digging for our pipe was this shiny material. People kept telling me it was just broken glass but after exploring the area better and after pulling a couple pieces out of the wall I realized it was a almost clear crystal with very defined layers to the crystal structure and growths off the side 

 

The pictures aren't the best, I can attempt to get better pictures of it tonight if it's too hard to identify.

 

Thank you for your time! Have a great day

[jasong]

Looks like calcite or barite. Barite would be noticeably heavy, calcite would feel like a normal rock weight.

Where you can see your finger through the crystal on the 1st pic, place that part over a book or newspaper and see if the text doubles. Calcite is bifringent. Calcite also should react with acid whereas I don't think barite will.