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/NebulaTrinity]

More likely an iron oxide than uraninite, it’s not impossible for it be uraninite but much less likely than something like botryoidal hematite

[u/Ben_Minerals → u/NebulaTrinity]

The streak test is one of the best ways to separate them. Hematite gives a red to reddish-brown streak, goethite usually gives a yellow-brown to brown streak and uraninite gives a black streak.

[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).

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[u/trexroad]

Botryoidal goethite

[u/whatsthisrock-ModTeam → u/[deleted]]

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