found this on the beach today.....Anthracite? space rock? what is it?

[SurfingDigger]

Its about the size of a dime....it has some weight to it...much heavier than you would think. very hard. does not stick to a magnet and makes no marks on white paper.

it kinda looks like anthracite..does anthracite read as metal? rings a nice clean tone 66 on the AT pro in all metal mode.

it was found on the beach in the cape canaveral area? possible rocket fuel?

let me know what you think.

 

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[Boatlode]

Could be heavily oxidized silver.

 

[Kodiak43351]

Could it be a burnt chuck of coal? I can't tell by pic but in the old home sites I hunt I find them a lot and they sound off around nickel on my pro.