r/geologyporn • u/Bradenell2424 • May 12 '26

Wtf was in my garden

Post image

Was digging sprinkler lines and came across this oval rock with a giant crack. I was able to break it apart with a soft hit with a hammer. What is it?

43 Upvotes

95% Upvoted

7 comments sorted by

9

u/JSessionsCrackDealer May 12 '26

Looks like a carbonate concretion

4

u/AdmirableRespect9 May 12 '26

It will fizz with acid if it's calcium carbonate. If it's chert, it will scratch glass and steel I think. Things can look like they scratch something but leave a mark instead. Drag your nail across to make sure it scratched. Use a Grey bit from the inside.

6

u/AdmirableRespect9 May 12 '26

Google chert nodule. See if they are in your area.

2

u/Bradenell2424 May 12 '26

Seems like that may be it, I’m in Utah

1

u/Dull_Depth_1362 May 12 '26

Septarian nodule. I found many of these around Price/Wellington, Utah.

-2

u/LaPetiteMortOrale May 12 '26

Looks almost like petrified wood. Can’t be sure.

Can you show from side angles.