tag:blogger.com,1999:blog-20092824.post4233695827703254267..comments2024-01-30T19:45:36.648+11:00Comments on Lounge of the Lab Lemming: Willy willyC W Mageehttp://www.blogger.com/profile/09706100504739548720noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-20092824.post-64169096749840477512008-09-01T14:17:00.000+10:002008-09-01T14:17:00.000+10:00There is a lot of kaolinite clay in the soils of t...There is a lot of kaolinite clay in the soils of the NT, and this is combined with a butt-load of hematite and other Fe-oxides and oxyhydroxides coating fine to very fine sand and coarse silt grains. Could the separation be a result of the gradation induced by a centrifuge-type process? It would be interesting to track the presence and absence of the inner white bit over differing substrates.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-20092824.post-13714174401323372452008-08-25T10:41:00.000+10:002008-08-25T10:41:00.000+10:00love the photos. We don't get many dust devils in ...love the photos. We don't get many dust devils in downtown LA, and now I'm kinda sorry about that. :)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-20092824.post-50330630486195188482008-08-15T22:57:00.000+10:002008-08-15T22:57:00.000+10:00Chuck, I didn't find a real definitive answer to y...Chuck, I didn't find a real definitive answer to your white v. red dust color question, but in the process found some interesting links and posted them.<BR/><BR/>I'm wondering if it isn't the amount of very fine particles in the center - if they are close enough together, they could reflect (or refract?) all light, making the color look white. Kind of like "high order" white in calcite under the Silver Foxhttps://www.blogger.com/profile/03131032620978696727noreply@blogger.comtag:blogger.com,1999:blog-20092824.post-33034199640654743142008-08-15T02:09:00.000+10:002008-08-15T02:09:00.000+10:00I should have come over and read this first. I ju...I should have come over and read this first. I just left a fairly lengthy comment at <A HREF="http://highway8a.blogspot.com/2008/08/dust-devil-links.html" REL="nofollow">Looking for Detatchment</A> that I think addresses the color part of your question.<BR/><BR/>Regarding the boundary between dusty air and clean air (it's dust, not condensation in every case I've ever seen or heard of), as the Lockwoodhttps://www.blogger.com/profile/05960762797349483760noreply@blogger.comtag:blogger.com,1999:blog-20092824.post-47744343580472058222008-08-11T23:39:00.000+10:002008-08-11T23:39:00.000+10:00That shouldn't give a sharp contact, it should giv...That shouldn't give a sharp contact, it should give a gradation- and there isn't much white dust out there...C W Mageehttps://www.blogger.com/profile/09706100504739548720noreply@blogger.comtag:blogger.com,1999:blog-20092824.post-5580446754703534422008-08-11T23:01:00.000+10:002008-08-11T23:01:00.000+10:00Good question Chuck... my guess is that, like a ce...Good question Chuck... my guess is that, like a centrifuge, larger/heavier dust grains are thrown to the outer edge while finer/lighter grains hang out near the center.<BR/><BR/>Just a guess, of course.Anonymousnoreply@blogger.com