Plaster casts?

[AugustMoose87]

I found these at an old mining ghost town, they caught my eye because they looked unusual. Very light, eye spys (no detector response).

 

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[PikesPeakCharlie]

They look like bone to me

 

[Back-of-the-boat]

Knee caps or some other bone piece from an animal IMO.

 

[BosnMate]

Bought a large bone at the pet store, and my dog chewed an end off that looked a lot like what you have.

 

[jewelerguy]

I have no idea what it is, but sometimes the words posted here just make me think of song titles or lyrics

 

[AugustMoose87]

Huh, I thought I was way too light to be bone, but I guess I've never taken a close enough look at a knee cap before... thanks gang!

 

[bradyboy]

can you carve it?
looks like stone to me

 

[AugustMoose87]

It's VERY light and very soft if it is stone.