Joe Rogan Experience #2558 - Tyler Engle · Aired Sep 24, 2026
Claim summary · not a verbatim quotation
Joe read a post saying samples taken inside the Great Pyramid in the 1970s found a crust of calcium sulfate up to an inch thick on the walls of the Queen's Chamber, and that this is what sulfuric acid leaves on limestone.
The finding
What the evidence shows
Salt crusts on the Queen's Chamber walls are real and have been reported since the 1800s. But a 2026 ScanPyramids study in Scientific Reports found the salt is mainly halite, ordinary sodium chloride, with no clear sign of widespread calcium sulfate. The researchers say the salt most likely comes from the limestone itself, which formed in ancient seawater, drawn out by humidity and moisture from visitors. That points away from acid residue.
Read the supporting source · www.nature.com ↗Quick answer & review status
Quick answer
Is it true that Joe read a post saying samples taken inside the Great Pyramid in the 1970s found a crust of calcium sulfate up to an inch thick on the walls of the Queen's Chamber, and that this is what sulfuric acid leaves on limestone?
Partly. The claim stretches what the evidence shows. Salt crusts on the Queen's Chamber walls are real and have been reported since the 1800s. But a 2026 ScanPyramids study in Scientific Reports found the salt is mainly halite, ordinary sodium chloride, with no clear sign of widespread calcium sulfate. Joe Rogan said it (matched by voice) on Joe Rogan Experience #2558 - Tyler Engle, aired Sep 24, 2026, at 2:02:35. The supporting source is nature.com, linked below.
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