Stromatolite?

[tjl96]

Hello! I have dug this large chunk of what I have been told is a stromatolite. It weighs about 85 lbs and is roughly 16" in any given direction, It has tons of veins of lacey chalcedony structures with lacey patterns of red white and black. All these veins are layered in as druze of red quartz. There appears to be three large white veins running through one end of it. I have other small pieces as well, but this large one is what I'm interested in. Thank you for any help it is very much appreciated!

Edited June 16 by tjl96

[tjl96]

From the middle of Wisconsin also. Not sure if native to the area I dug it up from.

[tjl96]

Sauk County Wisconsin, forgot to mention.