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Found near a cave in Kentucky. Thanks in advance. Tried googling but didn't feel any results matched this.
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Another view
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Haha. I gathered that much! Just curious as to what the black stone inside is.
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looks like chert
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>>974394
his name is dave
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>>974447
Fire treated chert.
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do the acid test, pour a little bit of anti-limestone (the stuff you use to clean the bathroom from calcareous deposits on it) and see what happens.
Chert won't fizzle (no reaction, since cherts are mostly silica).
Also if you break it the chert will present conchoidal fracturing and the edges can be very sharp, depends on the composition of the rock itself.
If you found those rocks inside beds of limestone then it's probably flint (which is still a kind of chert)
It then could be anything ranging from pure limestone (can be gray) to an hybrid (marls,calcareous mudstone, etc) it depends on the relative % of limestone/clay in it.
As a rough test the clay has a slick feeling on the fingers and it's softer than pure limestone , the limestone is just a rock and it's quite hard.
Or it could be igneous, without phenocrystals showing, I don't know about your location and the geology of Kentucky anyway.
Cheers
Also see here http://www.uky.edu/KGS/geoky/
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>>974471
Correction.
Insert the following sentence in between the 4th and 5th line.
If it fizzles from the acid test it means there is CaCO3 in it
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>>974452
Dave's not here man!
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>>974394
Looks like a petrified turd.
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>>974394
Looks like a chert nodule.
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Aluminium
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>>974394
Looks like obsidian
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>>977350
It looks literally nothing like obsidian.
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>>977544
You'll say we've got nothing in common
No common ground to start from
And we're falling apart
You say the world has come between us
Our lives have come between us
Still I know you just don't care
And I said "What about conchoidal fractures?"
She said "I think I fracture that way
And as I recall, I think we're both used for stone tools"
And I said "Well, that's the one thing we've got"
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