Mars Rock?

[Sunshine]

😅 Seriously, does anyone know their rocks well here on SGL? my friend threw a stone in my lap today and said “here, I found you a neat rock cause I know you like them” he found it while walking along a shoreline of Lake Huron. After looking at this rock for a while I am curious, it is unlike any stone I have seen in my years of occasional fossil hunting. It resembles Martian rock, imagine that!

[Zeta Reticulan]

This is Mars rock!

Sorry, I'll get my coat.

[laudropb]

Not a meteorite or Mars rock IMHO. Looks to be sedimentary rock.

[Barry Fitz-Gerald]

Looks like a piece of Pre-Cambrian chert to me, the lamination might suggest it is a fragment of a Stromatolite  which is a fossil formed by layers of cyanobacteria which trapped sentiment to build up reef like structures.  Almost as exciting as a a meteorite, but not quite. If complex life ever got established on Mars it might well have looked like this.

Edited August 3, 2022 by Barry Fitz-Gerald

[Tiny Clanger]

Gneiss, with maybe some striations caused by glacial transportation would be my guess . Fits with the location.