Pink rocks found around Lake Michigan ID?

[I_only_travel_for_rocks]

I've found a couple of these rocks with odd pink patches around Lake Michigan. All of them are lightweight, flat, and feel somewhat like pottery or sandstone worn smooth by the water. They are in no way translucent, and one side of each always has significantly more of the pink than the other. Each piece is only an inch or two in length. I've tried doing a reverse image search, but nothing that comes up seems to fit. Does anyone have any ideas?

 

[Johnho]

I looked around for this and couldn't really find anything just like that but from what I did see it might be an agate. The whitish material looks like quartz. The pink I have no idea. Lake Michigan shores seem to be a great place to collect rocks as they were deposited by glaciers and came from Canada a LONG time ag, Ice Age. the rounded shape is a result of the glaciers picking up surface rocks and as the glaciers moved the rocks were worn down into rounded shapes. As the glaciers retreated and melted they dropped all the debris they scooped up.

 

[I_only_travel_for_rocks]

I looked around for this and couldn't really find anything just like that but from what I did see it might be an agate. The whitish material looks like quartz. The pink I have no idea. Lake Michigan shores seem to be a great place to collect rocks as they were deposited by glaciers and came from Canada a LONG time ag, Ice Age. the rounded shape is a result of the glaciers picking up surface rocks and as the glaciers moved the rocks were worn down into rounded shapes. As the glaciers retreated and melted they dropped all the debris they scooped up.

Could it possibly be datolite? Datolite seems like its more crystal-y than this, but its the only thing I've been able to find so far that has patches of similar shape, and has been found in that location. These are a couple of the images that I'm comparing it to.