Native american Artifacts Bone Carving, Mortar, Arrowhead?

[Unitedstatesofamerica1]

 

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[quito]

Don't know about the shell piece, but the arrowhead more than likey is a knife. And the other piece looks natural.

 

[unclemac]

many shells naturally break down to that shape over time.

 

[Rege-PA]

My reply from another forum "
From what I see the square rock is a natural occuring iron concretion, if it had scraping or grinding marks inside it would be considered a paint pot, none are evident.
The shell whorl is interesting as they were ground down and the center stalk cut into beads and drilled. If found near an Indian site or far from the ocean could be a trade item.
Other appears to be a stone arrowhead made from quartzite, a hard material to knap, point appears to have suffered frontal impact damage but better picture needed. Keep looking!

 

[Unitedstatesofamerica1]

I actually posted this before I posted on that forum but yes you answered my question thank you!