So, what is this one?

[SorenCoins]

So I have always seen these and found them in rock piles, but never exactly knew what they were. I am 100% certain they are ferrous and pretty certain either oxide, hydroxide, or both. I forgot about them for a few years until Friday when a friend of mine asked me what they were. I could not give him a definitive answer, even though I've always assumed these as Hematite, I wasn't for sure. So, what are they? Maybe you guys have had this question or know this answer? Thanks.

 

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[DDancer]

Appears to be a type of concretion Soren. I feel its an oxide of iron and may have some hematite in the mix which is not unusual for concretions but yours is a good mix.

 

[Eu_citzen]

Streaktest them. Could be limonite, to.

 

[SorenCoins]

Yeah Ill do a streaktest, I think concretion is probably accurate. Had a whole bag of these, when I find it Ill update. Now Im off to go test it.