As to oxide coloration, I have been recently reading over the research
on the Triassic sandstone "red beds" which were laid down around the
time of the last Euro-Aftican-North American rift. Consequently the
same formation has exposures in southwest Europe, Morocco, and The north
eastern US. Analysis shows that iron oxide in concentrations as low as
.1 %(one tenth of one percent) are sufficent to give these beds their
deep red color.
Regards,
Elton
Michel Franco wrote:
Desert sand is not chemicaly aggressive. Desert sand is almost pure
silica ( Si O2). the color of the sand is given by oxydes in very
small proportions. Often iron oxydes.
______________________________________________
Meteorite-list mailing list
[EMAIL PROTECTED]
http://www.pairlist.net/mailman/listinfo/meteorite-list
