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Identity HelpNeed help IDing this rock/ore/garbage?

1st Oct 2014 00:53 UTCGregg H

I found this one the surface while out determining what kind of rocks we had on our property here in Reynolds County, Mo. We are located west of the Viburnum Trend in the NW part of the county. Almost all of the rocks we find are cherty dolostone and some sandstone which I am thinking is from the Gasconade Dolomite Formation. Mixed within some of the obvious dolostone boulders was this large rock like thing that I thought looked like some kind of ore. Have no clue what it is but is looked 300% different from anything else around it. I do not have many outcroppings and the ones I do are rather limited in exposure. Also mixed in with the Gasconade Dolomite boulders and other smaller stones are some chert boulders and stones that are from what I am thinking is the Roubidoux Formation. If this is this rock's native resting place then it must have come from the upper Gasconade or the lower Roubidoux. Of course I am not a geologist so I could be way way off.Any input would be great.

Location Found: NW Reynolds County Missouri 8 miles West of the Viburnum Trend mines

Streak: Brown

Hardness between 7-8

Whole piece in photo is approx 12 inches long by 4.0 inches high. Pieces can be chipped off rather easily and then crushed down to almost a dust with sand sized particles within.

Thanks

Gregg

1st Oct 2014 01:51 UTCPaul Brandes 🌟 Manager

Looks kinda like an iron-rich (hematite) pod that one commonly sees in dolomite/limestone. Hematite nodules are often formed in sedimentary rocks by oxidation of pyrite or marcasite (iron sulfide) crystals. Concretions and nodules, which may also be composed in part of limonite and goethite, come in a wide variety of bizarre shapes.

1st Oct 2014 02:38 UTCDoug Daniels

I agree with Paul - an iron-rich material, probably a mix of hematite/goethite/limonite. What color was the crushed powder? "Blood red" (red-brown) would be hematite, yellowish brown would be goethite/limonite. And there could be sand grains mixed in with it. Who knows, maybe even some arculadium (...a completely different thread....just for fun)

1st Oct 2014 15:55 UTCGregg H

-- moved topic --

1st Oct 2014 18:08 UTCGregg H

Thanks for the replies. With all the neat rocks at our place I hope to share more finds in the future.

Thanks,

Gregg

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