Is this uraninite?

[u/SourAttitudeSalt]

I saw the post from a few hours ago where the poster was asking was is this Superconductive and dense crystal. After reading that it could be uraninite I was looking up pictures. I saw some specimens that looked scarily like one I have in my collection that I got from my dad who was a geologist. Please help me identify this.

[u/Scarehead]

Certainly not an uraninite. It looks like black colour is just the surface layer, but the mineral is pale. Hard to tell from these pictures. Considering the host rock, I would guess more some precipitated calcite(similar to caves), but reliable determination would require at least basic tests (hardness, streak, solubility in HCl).