see #16 or the top of the topic for the meteoriticiron keyword:
http://www.freerepublic.com/focus/chat/3622655/posts?page=16#16
or here, for that matter:
http://www.freerepublic.com/tag/meteoriticiron/index
here’s a quick explanation of the original version of J-P Houdin’s internal ramp model, by Bob Brier:
https://archive.archaeology.org/0907/etc/khufu_pyramid.html