Better don't tell your dentist

This was a lot of my degree. We licked everything. Still do.

Mouthfeel is an incredible sense. Babies learn what the world is by pushing handfuls of it into their mouths. Texture, taste, angularity, porosity, density, degree of lithificaton.... instantly.

*edit: we did not all lick things. There are two distinct schools of thought, and not a lot of fence sitters.

I find a stone
But is it clay?
Or is it silt?
I cannot say.
I'll rub a bit
Just on my tooth,
If tooth falls out
I'll know the truth.

Maybe you think
My methods strange,
Maybe you think
They cause me pain.
But I'll keep rocks
All in my fist:
Not odd to me;
I'm geologist.

You can also differentiate between halite and sylvite using your tongue! Sylvite has a more tingly, "spicier" feeling and taste, whereas halite is simply salt.

Pretty sure that's most of them

So you want me to put dicks in my mouth? Alright, you have me convinced. Science needs me!

If you have two you can try to see if they’ll rattle

bone is less heavy than stone, also you can see bone has different surface structure.

Source: asked an archaeologist who thinks that although some people she knows do lik the bone, it's not necessary.