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Huh? I've never seen anyone seriously saying pyramids aren't made from natural stone. Seems like it would be very easy to check.

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https://en.wikipedia.org/wiki/Joseph_Davidovits

It's amusing to look into. Checking is not so easy - the concrete looks just like natural material. Finding an object embedded in the stone would prove it.

Couod we X-ray large sections of the pyramid?

X rays do not penetrate bone. Limestone, of whatever provenance, is denser than bone.

Examining a chip off a block under an electron microscope revealed differences from native stone.

X-rays do penetrate bone, just not very good. Otherwise one would not be able to make an X-ray of a human body.

Or, failing to find expected objects embedded.

By report, the Peruvian block faces lack the embedded marine animal shells found in natural limestone. (I have not examined them myself.)

It's easy to prove that ancients were unable to produce concrete. You just need to prove that they had no access to stone, fire, and water — the key ingredients required to make concrete.

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