Mammoth tusk ivory piece?

[NuHu]

cześć

 

To jest kawałek mamuta? 

Lokalizacja: okolice Wisły, Kraków, Polska Południowa 

Wiek: plejstocen? 

 

[Fossildude19]

This looks like a rock to me. 
Not seeing Schreger lines that would indicate ivory. 

 

Link to images

[caldigger]

Rock for me too.

[Ludwigia]

Interestingly shaped stone.

[Shellseeker]

Quote

The intersection of Schreger lines form angles, and this is the key—if the average angle is greater than 115 degrees, then it’s elephant ivory; if the average angle is less than 90 degrees, it’s mastodon or mammoth. Variations in the angles can occur in individual tusks, particularly as the patterns tighten more toward the center. Plus, the visible cross section must be cut square to the axis of the tusk—otherwise the chevrons’ angles will be distorted.

Specimens from both extinct and existing animals can show angles between 90 and 115 degrees in the outer Schreger lines, so the differentiation should never be based solely on a single angle measurement when the angles fall in this range. When averages are used, a clear separation between the ivory of existing elephants and extinct mammoths/mastodons exists. Elephant ivory averages above 100 degrees and mammoth/mastodon ivory averages below 100 degrees.

 

Fossils : You can not see the schreger lines in the 1st photo but you can in the 2nd photo

Another chunk, different location