*cobblestone is a technical term used by actual geologists.
**a boulder is also a technical term, although you won't find a boulder in Minecraft, it's probably safe to say that a stone block would be a small boulder.
But that's not the only way to classify the blocks you find in Minecraft. Another geological method of classifying rocks, one you probably learned in elementary school, is to divide rocks up according to origin: sedimentary, igneous, and metamorphic. Again, we have this in Minecraft: sandstone = sedimentary, obsidian = igneous, and stone = metamorphic. (Also, quartz is metamorphic, but that was added later).
When other dimensions are introduced, real-world comparisons are basically dropped. So netherrack is based on cobblestone, but "hellish". And End Stone is based on cobblestone, but with a negative texture, and inexplicably resistant to explosions.
But that doesn't mean we can't try to come up with explanations for what exactly these rocks are. And so, with that said, here's my theory on End Stone:
The End is like an asteroid, and the End Stone was formed in a low-gravity environment. End Stone forms from bits of gas and dust that gradually accrete into a floating island. So you'd think End Stone would be crumbly, like netherrack. Well, it's not, because End Stone is actually a kind of metamaterial, like aerogel. End Stone has an internal structure that makes it extremely light weight, and also extremely durable, and resistant to explosions. End Stone is made up of silicon and oxygen and aluminum and magnesium, just like stone, obsidian, and sandstone, but it's the configuration that's different.
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Possibly all of the endermen put down their blocks and stuff in a big gravity well or something, and over time the stuff was compressed into a sort of "cobblestone"? And the strange properties of the End messed with the molecular structure of the "cobblestone", turning it all into a uniform material and resistant to explosions? Maybe the endermen don't pick the end stone up because they can recognize it as all of their old stuff, just changed by the End's crazy physics? I use too many question marks?
I think Endstone is just cobblestone in a different dimension. Exact same properties, different appearance. Think of it like Team Fortress 2's Pyro Vision. It doesn't matter if it's rainbows or fire, they look different, but they do the same thing.