[meteorite-list] Simple tektite test
From: mafer_at_domafer.com <mafer_at_meteoritecentral.com>
Date: Thu Apr 22 09:53:36 2004 Message-ID: <014c01c2a888$30a16f60$6501a8c0_at_vs.shawcable.net> This is a multi-part message in MIME format. ------=_NextPart_000_0149_01C2A845.1974F3E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Norm Has anyone ever done a durometer comparison? I supose most would just = stop at a simple hardness test, but durometers can tell much about = ductility and given the mineral content in tektites, I'd wager that = they'd show some pretty funny numbers when compared to natural and man = made glsses. Just an idea, it works well for figuring out silicon = hardness. Mark ----- Original Message -----=20 From: N Lehrman=20 To: Matson, Robert ; mafer_at_domafer.com=20 Cc: meteorite-list_at_meteoritecentral.com=20 Sent: Friday, December 20, 2002 3:44 PM Subject: Re: [meteorite-list] Simple tektite test Rob and list, =20 Sounds like a good idea--but I just tried it, and both Thailandites = and Rizalites with impeccable credentials get just as hot as Apache = Tears that I collected directly from perlite outcrops. =20 Keep the ideas coming! =20 Norm ----- Original Message -----=20 From: Matson, Robert=20 To: 'N Lehrman' ; mafer_at_domafer.com=20 Cc: meteorite-list_at_meteoritecentral.com=20 Sent: Friday, December 20, 2002 2:51 PM Subject: [meteorite-list] Simple tektite test Hi All, =20 I believe this test was mentioned a while back by Bob Verish or = another list member, but can't you just put a tektite candidate in a microwave = oven, blast it for 30 seconds, and see if it gets hot? It is my = understanding that tektites (due to the low water content) will not; obsidian, apache = tears, terrestrial glass all will. --Rob -----Original Message----- From: N Lehrman [mailto:nlehrman_at_nvbell.net] Sent: Wednesday, December 18, 2002 11:25 PM To: mafer_at_domafer.com Cc: meteorite-list_at_meteoritecentral.com Subject: Re: [meteorite-list] Tektite identification criterion Mark and list, =20 Properties like those you've listed do show helpful variations, but = the range between individual tektite types tends to overlap with = terrestrial materials to the point that none of this allows one to = discriminate between tektites and other materials. =20 Despite the thousands of papers debating the myriad mysteries of = tektite lore, I don't know of any that directly address the fundamental = question "how do you tell if something is or is not a tektite?". I'd = love to hear from any of you out there with ideas or suggested = references. =20 I'm going to pull a synthesis of this subject together with time, = and there is a reasonable stash of widely scattered data that bear on = the subject. The really big challenge though is coming up with criteria = that can be used outside of a major university laboratory setting. For = example, one of the hallmark characteristics of tektite glass is its = exceedingly low water content. However, you'd be hard pressed to find = any commercial laboratory that could provide an accurate determination = of this property at the levels of resolution we require. Ditto a good = ion microprobe analysis. This is all great stuff in the academic = laboratory settings where most technical publications originate, but = what are we supposed to do out here on the front lines? =20 Of course, there are great folks in academia who will collaborate on = worthy issues, but such matters cannot extend to passing judgment on = suspect materials that arrive in the mail every other week. You = meteorite freaks know the routine well---and have developed a pretty = good bag of tricks to screen the winners from the losers. With = tektites, we've barely emerged from debating the very definition of the = word. =20 =20 Cheers, =20 Norm (TektiteSource.com) ------=_NextPart_000_0149_01C2A845.1974F3E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D"MSHTML 5.00.2614.3500" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT size=3D2>Hi Norm</FONT></DIV> <DIV><FONT size=3D2>Has anyone ever done a durometer comparison? I = supose most=20 would just stop at a simple hardness test, but durometers can tell much = about=20 ductility and given the mineral content in tektites, I'd wager that = they'd show=20 some pretty funny numbers when compared to natural and man made glsses. = Just an=20 idea, it works well for figuring out silicon hardness.</FONT></DIV> <DIV><FONT size=3D2>Mark</FONT></DIV> <BLOCKQUOTE dir=3Dltr=20 style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: = 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> <DIV=20 style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B>=20 <A href=3D"mailto:nlehrman_at_nvbell.net" title=3Dnlehrman@nvbell.net>N = Lehrman</A>=20 </DIV> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20 href=3D"mailto:ROBERT.D.MATSON_at_saic.com" = title=3DROBERT.D.MATSON_at_saic.com>Matson,=20 Robert</A> ; <A href=3D"mailto:mafer_at_domafer.com"=20 title=3Dmafer_at_domafer.com>mafer@domafer.com</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A=20 href=3D"mailto:meteorite-list_at_meteoritecentral.com"=20 = title=3Dmeteorite-list_at_meteoritecentral.com>meteorite-list@meteoritecentr= al.com</A>=20 </DIV> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, December 20, 2002 = 3:44=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [meteorite-list] = Simple=20 tektite test</DIV> <DIV><BR></DIV> <DIV><FONT size=3D2>Rob and list,</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Sounds like a good idea--but I just tried it, and = both=20 Thailandites and Rizalites with impeccable credentials get just as hot = as=20 Apache Tears that I collected directly from perlite = outcrops.</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Keep the ideas coming!</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Norm</FONT></DIV> <BLOCKQUOTE dir=3Dltr=20 style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; = MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> <DIV=20 style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B>=20 <A href=3D"mailto:ROBERT.D.MATSON_at_saic.com"=20 title=3DROBERT.D.MATSON_at_saic.com>Matson, Robert</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20 href=3D"mailto:nlehrman_at_nvbell.net" title=3Dnlehrman@nvbell.net>'N = Lehrman'</A>=20 ; <A href=3D"mailto:mafer_at_domafer.com"=20 title=3Dmafer_at_domafer.com>mafer@domafer.com</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A=20 href=3D"mailto:meteorite-list_at_meteoritecentral.com"=20 = title=3Dmeteorite-list_at_meteoritecentral.com>meteorite-list@meteoritecentr= al.com</A>=20 </DIV> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, December 20, = 2002 2:51=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [meteorite-list] = Simple=20 tektite test</DIV> <DIV><BR></DIV> <DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN = class=3D629105922-20122002>Hi=20 All,</SPAN></FONT></DIV> <DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20 class=3D629105922-20122002></SPAN></FONT> </DIV> <DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN = class=3D629105922-20122002>I=20 believe this test was mentioned a while back by Bob Verish or = another=20 list</SPAN></FONT></DIV> <DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20 class=3D629105922-20122002>member, but can't you just put a tektite = candidate=20 in a microwave oven,</SPAN></FONT></DIV> <DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20 class=3D629105922-20122002>blast it for 30 seconds, and see if it = gets=20 hot? It is my understanding that</SPAN></FONT></DIV> <DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20 class=3D629105922-20122002>tektites (due to the low water content) = will not;=20 obsidian, apache tears,</SPAN></FONT></DIV> <DIV><FONT color=3D#0000ff face=3DArial size=3D2><SPAN=20 class=3D629105922-20122002>terrestrial glass all will. =20 --Rob</SPAN></FONT></DIV> <DIV align=3Dleft class=3DOutlookMessageHeader dir=3Dltr><FONT = face=3DTahoma=20 size=3D2>-----Original Message-----<BR><B>From:</B> N Lehrman=20 [mailto:nlehrman_at_nvbell.net]<BR><B>Sent:</B> Wednesday, December 18, = 2002=20 11:25 PM<BR><B>To:</B> <A=20 = href=3D"mailto:mafer_at_domafer.com">mafer@domafer.com</A><BR><B>Cc:</B> <A = = href=3D"mailto:meteorite-list_at_meteoritecentral.com">meteorite-list@meteor= itecentral.com</A><BR><B>Subject:</B>=20 Re: [meteorite-list] Tektite identification = criterion<BR><BR></FONT></DIV> <DIV><FONT size=3D2>Mark and list,</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Properties like those you've listed do show = helpful=20 variations, but the range between individual tektite types tends to = overlap=20 with terrestrial materials to the point that none of this allows one = to=20 discriminate between tektites and other materials.</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Despite the thousands of papers debating the = myriad=20 mysteries of tektite lore, I don't know of any that directly address = the=20 fundamental question "how do you tell if something is or is not a=20 tektite?". I'd love to hear from any of you out there with = ideas or=20 suggested references.</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>I'm going to pull a synthesis of this subject = together=20 with time, and there is a reasonable stash of widely scattered data = that=20 bear on the subject. The really big challenge though is coming = up with=20 criteria that can be used outside of a major university laboratory=20 setting. For example, one of the hallmark characteristics of = tektite=20 glass is its exceedingly low water content. However, you'd be = hard=20 pressed to find any commercial laboratory that could provide an = accurate=20 determination of this property at the levels of resolution we = require. =20 Ditto a good ion microprobe analysis. This is all great stuff = in the=20 academic laboratory settings where most technical publications = originate,=20 but what are we supposed to do out here on the front = lines?</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Of course, there are great folks in academia who = will=20 collaborate on worthy issues, but such matters cannot extend to = passing=20 judgment on suspect materials that arrive in the mail every other=20 week. You meteorite freaks know the routine well---and have = developed=20 a pretty good bag of tricks to screen the winners from the = losers. =20 With tektites, we've barely emerged from debating the very = definition of the=20 word. </FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Cheers,</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Norm</FONT></DIV> <DIV><FONT=20 size=3D2>(TektiteSource.com)</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY= ></HTML> ------=_NextPart_000_0149_01C2A845.1974F3E0-- Received on Fri 20 Dec 2002 07:30:25 PM PST |
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