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Some sort of igneous rock? Western NY state


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I know this isn't a fossil or some sort of exotic rock, but I can't identify it. It was found on a riverbank. I couldn't get a good answer from the "what's this rock?" reddit site.

I only got one answer that told me it was a trachyte which doesn't make sense to me since I'm nowhere near a volcano. It's slightly magnetic and very heavy (24lbs) very-heavy-blue-ish-rock-that-has-magnetic-properties-v0-6tav099kstad1.thumb.webp.d5b404e2233431ac8d2cce4896113e02.webp


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The place of discovery is important for any attempt at identification. Indeed, it makes it possible to determine a stratigraphic level and to know the possible fossils when one suspects that the demand may concern them, but also to know more about its environment, and to deduce for example if it is a igneous medium, sedimentary etc...


That’s just a rock in its broadest sense. I can’t say any more from that picture. If it sparkles by putting a little white vinegar on it will be deduced that it contains limestone (and it will be necessary to rinse).


We have some specialists who could answer you, wait for their opinion.



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Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici
Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
Oeufs sélaciens récents : ici
Otolithes de poissons récents ! ici

Un Greg...

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"In every walk with nature one receives far more than he seeks."

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This looks like a plutonic igneous rock. Similar to granitic rock, it has some crystals forming when it cooled rapidly

Do not recall the nomenclature for this type rock ..

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Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."


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My Fossil collection - My Mineral collection

My favorite thread on TFF.



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