The target mineral is separated using heavy liquids, then hand-picked under the microscope for the purest possible sample.This mineral sample is then baked gently overnight in a vacuum furnace.even if he provided some source by which we could check this story ...
The mineral sanidine, the high-temperature form of potassium feldspar, is the most desirable.
But micas, plagioclase, hornblende, clays and other minerals can yield good data, as can whole-rock analyses.
A precise amount of argon-38 is added to the gas as a "spike" to help calibrate the measurement, and the gas sample is collected onto activated charcoal cooled by liquid nitrogen.
Then the gas sample is cleaned of all unwanted gasses such as H, nitrogen and so on until all that remains are the inert gasses, argon among them.
The rock samples are crushed, in clean equipment, to a size that preserves whole grains of the mineral to be dated, then sieved to help concentrate these grains of the target mineral.
The selected size fraction is cleaned in ultrasound and acid baths, then gently oven-dried.
The fact remains that these are fossils of hominids of certain structure found in strata that both labs agree is more than 1 million and less than 2 million years old!
This tactic of "if scientists disagree *at all*, then we are free to disregard everything they all say as 'meaningless'." ...
"So, in short, the answer is 'none of the above', but to tell the truth would give you a failing grade.