What is it?

Manganese dendritic

@fernando-rivera-2 I agree with @jeanpierre-tutusaus. Manganese forms this pattern on rocks. It’s tricky because it looks like it should be a fossil but it’s just a mineral deposit.

@fernando-rivera-2 I agree with @jeanpierre-tutusaus and @mackenzie-smith

pyrolusite, manganese dioxide. often called a pseudo fossil

Thanks

Do you have more photos, @fernando-rivera-2? This appears to be an agate or another concretion, but more photos will help with ID.

@fernando-rivera-2 Can you zoom in on one of the grey objects in the specimen on the right please? Thanks!

Hi, @Fernando-Rivera-2, this appears to be a piece of concrete with a small shell imprint in the upper left. More photos would help this ID.

Hi, @Fernando-Rivera-2, this appears to be a piece of concrete with a small shell imprint in the upper left. More photos would help this ID.

Hi @Fernando-Rivera-2, unfortunately eMuseum specimens must only have fossils from a single individual organism, so I must mark this as ‘not a specimen’ – however, it will stay up in the group for people to comment on and hopefully help you ID!

Thanks

Hi @Fernando-Rivera-2, unfortunately eMuseum specimens must only have fossils from a single individual organism, so I must mark this as ‘not a specimen’ – however, it will stay up in the group for people to comment on and hopefully help you ID!

Unfortunately, I believe this is a concretion, @Fernando-Rivera-2. Do you have any other photos?

Unfortunately, I believe this is a concretion, @Fernando-Rivera-2. Do you have any other photos?