[meteorite-list] Sahara sand
From: MuseumStore/NatureSource <musnat_at_meteoritecentral.com>
Date: Thu Apr 22 09:52:06 2004 Message-ID: <001f01c23cd2$9570edc0$7c8a70d1_at_JCD> This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C23C8F.86B69DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks for your response, Dave! The pieces I have seen so far are fairly nondescript, but I will have = fun looking through it to see if anything meteorite-esque pops up! Regards, Jeannie -----Original Message----- From: Dave Mouat <dmouat_at_dri.edu> To: MuseumStore/NatureSource <musnat_at_alaska.net> Cc: Meteorite List <meteorite-list_at_meteoritecentral.com> Date: Monday, August 05, 2002 1:32 PM Subject: Re: [meteorite-list] Sahara sand =20 =20 I hope this finds the sender.=20 Much of the world's sandy deserts are reddish. Usually, the redder = sands indicate somewhat older dunes. The dunes of Namibia may be over = 20 million years old. Whoops, off the subject.=20 The redness does imply iron staining with the total iron content = less than 1%. Little black specks are most likely magnetite but could = be micro meteorites.=20 The rest of the material (yawn) is most likely quartz.=20 Dave=20 MuseumStore/NatureSource wrote:=20 (I tried to post this yesterday, but didn't see it come up. = Sorry if it's a repeat!) Hi List!=20 Can anyone tell me anything about the general composition of = Sahara Desert sand? I have a couple vials that I've been looking at on = my lunch break. Just out of curiosity, I held a Nd magnet against the = glass of the vial and several little black specks jumped up on to the = magnet. I looked at them under a binocular microscope. I couldn't rule = them in or out as little micrometeorites. The orange color of the sand = leads me to believe that iron may be a factor in the sand's coloration = and composition, and that these specks may just be ferrous minerals and = nothing to get too excited about. Has anyone come across this? Does = anyone have any information/thoughts/comments? Regards,Jeanne DevonIMCA = #9236www.thenaturesource.comThe Museum Store/The Nature Source=20 ------=_NextPart_000_001C_01C23C8F.86B69DE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <HTML> <HEAD> <META content=3Dtext/html;charset=3Diso-8859-1 = http-equiv=3DContent-Type><!doctype html public "-//w3c//dtd html 4.0 = transitional//en"> <META content=3D'"MSHTML 4.72.3110.7"' name=3DGENERATOR> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT color=3D#000000 size=3D2>Thanks for your response, = Dave!</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV> <DIV><FONT size=3D2>The pieces I have seen so far are fairly = nondescript, but I=20 will have fun looking through it to see if anything meteorite-esque pops = up!</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Regards,</FONT></DIV> <DIV><FONT size=3D2>Jeannie</FONT></DIV> <BLOCKQUOTE=20 style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: = 5px"> <DIV><FONT face=3DArial size=3D2><B>-----Original = Message-----</B><BR><B>From:=20 </B>Dave Mouat <<A=20 href=3D"mailto:dmouat_at_dri.edu">dmouat@dri.edu</A>><BR><B>To:=20 </B>MuseumStore/NatureSource <<A=20 = href=3D"mailto:musnat_at_alaska.net">musnat@alaska.net</A>><BR><B>Cc:=20 </B>Meteorite List <<A=20 = href=3D"mailto:meteorite-list_at_meteoritecentral.com">meteorite-list@meteor= itecentral.com</A>><BR><B>Date:=20 </B>Monday, August 05, 2002 1:32 PM<BR><B>Subject: </B>Re: = [meteorite-list]=20 Sahara sand<BR><BR></DIV></FONT>I hope this finds the sender. = <BR>Much of=20 the world's sandy deserts are reddish. Usually, the redder = sands=20 indicate somewhat older dunes. The dunes of Namibia may be = over 20=20 million years old. Whoops, off the subject. <BR>The redness = does imply=20 iron staining with the total iron content less than 1%. Little = black=20 specks are most likely magnetite but could be micro meteorites. = <BR>The rest=20 of the material (yawn) is most likely quartz. <BR>Dave=20 <P>MuseumStore/NatureSource wrote:=20 <BLOCKQUOTE TYPE =3D CITE> <FONT color=3D#000000><FONT = size=3D-1>(I tried=20 to post this yesterday, but didn't see it come up. Sorry = if it's a=20 repeat!)</FONT></FONT> <FONT face=3DArial><FONT = size=3D-1>Hi=20 List!</FONT></FONT> <BR> <FONT color=3D#000000><FONT = size=3D-1>Can=20 anyone tell me anything about the general composition of Sahara = Desert=20 sand? I have a couple vials that I've been looking at on = my lunch=20 break. Just out of curiosity, I held a Nd magnet against = the glass=20 of the vial and several little black specks jumped up on to the=20 magnet. I looked at them under a binocular = microscope. I=20 couldn't rule them in or out as little=20 micrometeorites.</FONT></FONT> <FONT color=3D#000000><FONT=20 size=3D-1>The orange color of the sand leads me to believe that = iron may=20 be a factor in the sand's coloration and composition, and that = these=20 specks may just be ferrous minerals and nothing to get too = excited=20 about.</FONT></FONT> <FONT size=3D-1>Has anyone come across = this?=20 Does anyone have any = information/thoughts/comments?</FONT> <FONT=20 size=3D-1>Regards,</FONT><FONT size=3D-1>Jeanne = Devon</FONT><FONT=20 size=3D-1>IMCA #9236</FONT><FONT size=3D-1><A=20 = href=3D"http://www.thenaturesource.com">www.thenaturesource.com</A></FONT= ><FONT=20 color=3D#000000><FONT size=3D-1>The Museum Store/The Nature=20 = Source</FONT></FONT> </BLOCKQUOTE></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_001C_01C23C8F.86B69DE0-- Received on Mon 05 Aug 2002 06:51:05 PM PDT |
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