Half of an EGG?

[HappyTrails55]

Found this while prospecting, have found these before in the desert, your comments are Appreciated...Darrell

 

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[gord]

Broken coprolite is the first thing that comes to mind.

 

[naturegirl]

wouldn't a coprolite that size be as cool as an egg?

 

[gord]

So long as it wasn't still sticky, yeah.

 

[Harry Pristis]

"in the desert" tells us nothing of the geology of the area in which this rock was found.

I do think it's simply a severely weathered and stream-rounded rock. (If it's from the Sahara Desert, it could be windblown sand-abraded rather than stream-abraded.)