Nobody can tell me what this is

Unkrock

Tenderfoot
May 20, 2018
7
4
Primary Interest:
All Treasure Hunting
A friend obtained this rock from an old neighbor after he passed away. When he was alive he kept it outside in his rock garden and told her "it came from the sky", I am not so sure about that but since nobody can identify it I am curious as to what it really is.

I am attaching pictures of the measurements = 8" long - 5 1/2" across - 16" around - weighs 20 pounds. When looking at the pictures remember it has been outside in a rock garden for years. I do not have any clue where it came from; he lived in the Portland Oregon Metro area (Molalla).

It isn't magnetic except for the little shavings off it does stick to a magnet but the big rock doesn't hold a magnet. We broke off a piece to see what it looks like inside, it's very sparkly and silvery inside, also very hard and sharp. It's hard but you can crush it into small granules, If you look close up in the pictures you can see little spots of color. We don't think it's a metal, possibly a mineral It does not set off a metal detector.


2rock.jpgrock1.jpg12rock.jpg10rock.jpg9rock.jpg8rock.jpg7rock.jpg5rock.jpg6rock.jpg4rock.jpg20180514_233920.jpg
 

I can tell you, it didn't come from the sky. I can't tell you what exactly it is, though based on the photos, to me, it just looks like coal. There is another type stone out here on the east coast that looks similar and contains iron, but I don't know the name unfortunately.
 

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Maybe take a lighter to a tip of the rock and see if it is flammable?
 

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Thank you for your input, it's not coal, it weighs 20 pounds way heavier than it looks!
 

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We have thought that too but wouldn't that be detected on a metal detector? and we have taken it to 5 different rock and mineral shops, I would think they would recognize it? I don't know much about rocks at all, is lead ore common? We are in Oregon. I think it's a mineral of some kind and super dense/heavy for the size.
 

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lol... it's possible but it would be hard to throw, we broke off a couple pieces, it wasn't easy to break, but it did weigh 26 pounds.
 

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It looks like a large "clinker" from an old coal fired boiler of some sort. Clinkers are essentially slag that consist of noncombustible elements and minerals found in coal. They melt and create lumps. Big pain the butt for boiler operators.
 

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It's called Coke. Its made from coal and used as a fuel.
If its been soaked by the rain, just like wet coal, you my not be able to ignite it easily.
 

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It reminds me of Stibnite (Antimony Sulfide), but I think Sphalerite is more likely. Both are in the sulfide mineral class and have a similar appearance in their massive habit. The first image below is Stibnite and the second is Sphalerite.

Stibnite.jpgSphalerite.jpg

Sphalerite has a variable iron content which could account for magnetism of the divided particles and there are local sources relatively near you. One is Watson Lake in the Yukon Territory and the other is Eagle Mine in Colorado. A streak and hardness test would be the best way to differentiate the two.
 

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Clinker could make sense the other rock she has from him I will try to post - we think it is slag. We are taking them up to the Rice Northwest rock and mineral museum this afternoon to see if they can identify it. I'll let you know. Thank yougreenrock4.jpggreen rock 2.jpggreen rock 1.jpg
 

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We have confirmation!! From the Rock and Mineral Museum Curator, it is....... Specularite Hematite. Now, where would one sell something like that?
 

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