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Knowledgeable help to see if this is mammoth ivory, thank you.

It is mammoth ivory, and the cross section of the product has a certain distance interval, and the longitudinal texture is clear and uniform. It has a rhombic structure, crossed by arcs, and the cross section is less than 90 o. This texture, also called Lutz texture line, is a unique feature of mammoth ivory (see the picture below for the standard texture picture of mammoth ivory).