[meteorite-list] Tektite surface morphology
From: Murakami Josesh <murakamij004_at_meteoritecentral.com>
Date: Thu Apr 22 09:42:06 2004 Message-ID: <000f01c0883b$2ae56aa0$14441f18_at_hawaii.rr.com> This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C087E7.5710FC60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hey gang, Nothing too profound, but a puzzle in my mind... I just wanted to ask what the group thought of Mike Blood's 'stretch' = tektite?? =20 I've become convinced in my mind that w/ regards to the surface = morphology of tektites, that the wonderful deep scoriations and other = worm-like burrowing features seen on our tektites are due to acid = etching changes that occur over a number of years either submerged in = water or in contact w/ soil acids, etc. =20 The 'hedgehog' moldavites seem to show stages of dessolution from rather = featureless blobs all the way to deeply etched hedgehogs. (I can't = figure how chemical etching resulted in some of the deep worm burrows = that dive deep into the core of some of the moldavites I have...) Seeing some of the Columbianites (sic) on Ebay showed surface features = indistinguishable from those seen on our common Indochinite tektites, = affirming in my mind, at least until seeing Mike's 'stretch' specimen, = that even volcanic glass under the influence of burial and submergence = might 'erode' or etch in a typically 'tektitic' manner. Also thought that the wonderfully circumsectioned Rizalites were the = product of 'natural chemical etching.' I think someone alluded previously to some experiments someone did w/ = phosporic acid or nitric acid or such w/ reproduction of the etched = pattern on some Indochinites. And yet, a casual inspection of Mike's stretch tektites would suggest = that at a taffy-soft stage, that some tektites might be exposed to = bending and stretching forces that pull apart the primarily solidified = crust.... Then why doesn't the taffy-pull section show the type of = chemical etching that the rest of the tektite specimen's crust show??=20 Beats me... Joseph=20 Honolulu ------=_NextPart_000_000C_01C087E7.5710FC60 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 face=3DArial size=3D2>Hey gang,</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>Nothing too profound, but a puzzle in = my=20 mind...</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>I just wanted to ask what the group = thought of Mike=20 Blood's 'stretch' tektite?? </FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>I've become convinced in my mind that = w/ regards to=20 the surface morphology of tektites, that the wonderful deep scoriations = and=20 other worm-like burrowing features seen on our tektites are due to acid = etching=20 changes that occur over a number of years either submerged in water or = in=20 contact w/ soil acids, etc. </FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>The 'hedgehog' moldavites seem to show = stages of=20 dessolution from rather featureless blobs all the way to deeply etched=20 hedgehogs. (I can't figure how chemical etching resulted in some = of the=20 deep worm burrows that dive deep into the core of some of the moldavites = I=20 have...)</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>Seeing some of the Columbianites (sic) = on =20 Ebay showed surface features indistinguishable from those seen on our = common=20 Indochinite tektites, affirming in my mind, at least until seeing Mike's = 'stretch' specimen, that even volcanic glass under the influence of = burial and=20 submergence might 'erode' or etch in a typically 'tektitic' = manner.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>Also thought that the wonderfully = circumsectioned=20 Rizalites were the product of 'natural chemical etching.'</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>I think someone alluded previously to = some=20 experiments someone did w/ phosporic acid or nitric acid or such w/ = reproduction=20 of the etched pattern on some Indochinites.</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>And yet, a casual inspection of Mike's = stretch=20 tektites would suggest that at a taffy-soft stage, that some tektites = might be=20 exposed to bending and stretching forces that pull apart the primarily=20 solidified crust.... Then why doesn't the taffy-pull section = show=20 the type of chemical etching that the rest of the tektite specimen's = crust=20 show?? </FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>Beats me...</FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2><BR>Joseph = <BR>Honolulu</FONT></DIV></BODY></HTML> ------=_NextPart_000_000C_01C087E7.5710FC60-- Received on Sat 27 Jan 2001 03:28:43 AM PST |
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