unknown rock [to me]

[eureka77]

Can ya'll tell me what this is? Found in the backwoods of North Carolina piedmont region. My whites goldmaster 4/b sounds off like crazy on it but isn't registering iron. It's not magnetic, does a faint streak of black on porceilen. It's real light weight like pumice. I found a smaller one and broke it up, It's all black and ashy feeling when ground up, almost like charcoal.

 

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[Eu_citzen]

Bituminous coal possibly? (aka Black coal)
What streak colour does it leave?
Magnetic?
Scratch-able with knife?

 

[strickman]

hot rock

 

[littleneckhalfshell]

coke? (the fuel kind) or maybe coked coal from a blacksmith's forge? Metalurgical coke is light, and crumbles, what does it smell like?

 

[eureka77]

No odor at all. It takes a hammer to break it. A tree uprooted along the creek and this was under the root mass. Not sure of any blacksmithing around. Although I wouldn't be suprised, I find bits of trash and metal miles from anywhere so you never know. It's a hotrock just wondering the geneoligy name of it. I know its hard to identify over the internet.

 

[Eu_citzen]

Hardness?
And does it leave a black colour on your finger to?