[meteorite-list] Tektite surface morphology
From: Darryl S. Futrell <futrelds_at_meteoritecentral.com>
Date: Thu Apr 22 09:42:06 2004 Message-ID: <004301c08910$799d2e00$5c42243f_at_pavilion> This is a multi-part message in MIME format. ------=_NextPart_000_0040_01C088CD.53D64B40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable -----Original Message----- From: Murakami Josesh <murakamij004_at_hawaii.rr.com> To: meteorite-list_at_meteoritecentral.com = <meteorite-list_at_meteoritecentral.com> Date: Saturday, January 27, 2001 1:04 PM Subject: [meteorite-list] Tektite surface morphology =20 =20 Dean Chapman claimed that alkalies do more damage than acids to = tektite glasses (except for hydrofluoric acid). He (and possibly a = co-author) also demonstrated that the Australasian splashform tektites = all entered our atmosphere as cold rigid bodies. I don't know the exact = paper, and it would take me perhaps a day of reading to locate it. I = can, however, list several references if anyone wants to look for it. =20 There are lotsa sites around the world where terrestrial obsidians = are pitted like many tektites. In my part of the world there are = several. There is a photo of three from east of Safford, AZ in the May = 1967 Sky and Telescope on pg 275. Also Coso Domes, CA: Lee Humiston and = Richard Zbur, April 1963, Comparison of surface features of tektites and = geothermally etched obsidian. NOTS TP 3142, U. S. Naval OrdnanceTest = Station, China Lake, CA , 28 pgs. (profusely illustrated). =20 I have two Philippinite medium-sized spheres that illustrate how = many tektites get their sculptation. One has experienced virtually no = weathering. It shows a crazing pattern all around it of fine, narrow, = connected cracks with sharp edges. Another specimen of exactly the same = shape has experienced much weathering. A similar overall pattern of = fine cracks has been transformed into deeper U shaped groves, some of = which are now close to a cm wide. Everyone is welcome to come see these = specimens for yourself, plus a wide range of other specimens. Whittier, CA. =20 For an explanation of how and why crazing patterns occur in layered = tektites. you might want to have a look at D. Futrell, 1986, Buried = crazed layers in Australasian Muong Nong-type tektites. J. = Non-Crystalline Solids, 86, 213-218. =20 I've also got pitted Roman glasses from Libya and elsewhere. Also a = several hundred year old shipwrecked bottle bottom that looks exactly = like ungrooved large Philippine spheres. Plus lots of pitted and = grooved terrestrial obsidians =20 Futrell=20 =20 =20 ------=_NextPart_000_0040_01C088CD.53D64B40 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> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV> </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>Murakami Josesh <<A=20 = href=3D"mailto:murakamij004_at_hawaii.rr.com">murakamij004@hawaii.rr.com</A>= ><BR><B>To:=20 </B><A=20 = href=3D"mailto:meteorite-list_at_meteoritecentral.com">meteorite-list@meteor= itecentral.com</A>=20 <<A=20 = href=3D"mailto:meteorite-list_at_meteoritecentral.com">meteorite-list@meteor= itecentral.com</A>><BR><B>Date:=20 </B>Saturday, January 27, 2001 1:04 PM<BR><B>Subject: = </B>[meteorite-list]=20 Tektite surface morphology<BR><BR></DIV></FONT> <DIV><FONT face=3DArial size=3D2></FONT><FONT color=3D#000000=20 face=3D"Arial Rounded MT Bold">Dean Chapman claimed that alkalies do = more=20 damage than acids to tektite glasses (except for hydrofluoric = acid). =20 He (and possibly a co-author) also demonstrated that the = Australasian=20 splashform tektites all entered our atmosphere as cold rigid = bodies. I=20 don't know the exact paper, and it would take me perhaps a day of = reading to=20 locate it. I can, however, list several references if anyone = wants to=20 look for it.</FONT></DIV> <DIV><FONT color=3D#000000 face=3D"Arial Rounded MT = Bold"></FONT> </DIV> <DIV><FONT color=3D#000000 face=3D"Arial Rounded MT Bold">There are = lotsa sites=20 around the world where terrestrial obsidians are pitted like many=20 tektites. In my part of the world there are several. = There is a=20 photo of three from east of Safford, AZ in the May 1967 Sky and = Telescope on=20 pg 275. Also Coso Domes, CA: Lee Humiston and Richard Zbur, = April=20 1963, Comparison of surface features of tektites and geothermally = etched=20 obsidian. NOTS TP 3142, U. S. Naval OrdnanceTest Station, = China Lake,=20 CA , 28 pgs. (profusely illustrated).</FONT></DIV> <DIV><FONT color=3D#000000 face=3D"Arial Rounded MT = Bold"></FONT> </DIV> <DIV><FONT color=3D#000000 face=3D"Arial Rounded MT Bold">I have two = Philippinite medium-sized spheres that illustrate how many tektites = get=20 their sculptation. One has experienced virtually no = weathering. =20 It shows a crazing pattern all around it of fine, narrow, connected = cracks=20 with sharp edges. Another specimen of exactly the same shape = has=20 experienced much weathering. A similar overall pattern of fine = cracks=20 has been transformed into deeper U shaped groves, some of which are = now=20 close to a cm wide. Everyone is welcome to come see these = specimens=20 for yourself, plus a wide range of other specimens.</FONT></DIV> <DIV><FONT color=3D#000000 face=3D"Arial Rounded MT = Bold"></FONT><FONT=20 face=3D"Arial Rounded MT Bold">Whittier, CA.</FONT></DIV> <DIV> </DIV> <DIV><FONT color=3D#000000 face=3D"Arial Rounded MT Bold">For an = explanation of=20 how and why crazing patterns occur in layered tektites. you might = want to=20 have a look at D. Futrell, 1986, Buried crazed layers in = Australasian Muong=20 Nong-type tektites. J. Non-Crystalline Solids, 86,=20 213-218.</FONT></DIV> <DIV><FONT color=3D#000000 face=3D"Arial Rounded MT = Bold"></FONT> </DIV> <DIV><FONT face=3D"Arial Rounded MT Bold">I've also got pitted Roman = glasses=20 from Libya and elsewhere. Also a several hundred year old = shipwrecked=20 bottle bottom that looks exactly like ungrooved large Philippine=20 spheres. Plus lots of pitted and grooved terrestrial=20 obsidians</FONT></DIV> <DIV><FONT color=3D#000000 face=3D"Arial Rounded MT = Bold"></FONT> </DIV> <DIV><FONT color=3D#000000=20 face=3D"Arial Rounded MT Bold">Futrell </FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV> </DIV></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_0040_01C088CD.53D64B40-- Received on Sun 28 Jan 2001 04:55:02 AM PST |
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