[meteorite-list] African Moldivte
From: mafer_at_domafer.com <mafer_at_meteoritecentral.com>
Date: Thu Apr 22 09:53:33 2004 Message-ID: <02cd01c29edf$142415c0$6401a8c0_at_vs.shawcable.net> This is a multi-part message in MIME format. ------=_NextPart_000_02CA_01C29E9C.0549BAC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I should have added obsidian to my list for comparisons: a.. Color is dark green to dark brown and black, also can show sheens = of gold or green, yellow, blue and/or purple coloration. Sometimes with = white inclusions (Snowflake Obsidian).=20 b.. Luster is vitreous.=20 c.. Transparency: Obsidian is translucent in any stone of appreciable = size.=20 d.. Crystal System does not apply because obsidian is amorphous.=20 e.. Habits include compact nodules or as massive layers between other = volcanic rocks=20 f.. Fracture is conchoidal.=20 g.. Hardness is 5 - 5.5 (much softer than quartz).=20 h.. Specific Gravity is approximately 2.6 (average)=20 i.. Streak is white.=20 j.. Other Characteristics: Generally lacks open voids or large bubbles = like other volcanic rocks.=20 k.. Notable Occurrences include Italy; Mexico; Scotland; Arizona, = Colorado, Texas, Utah and Idaho, USA.=20 l.. Best Field Indicators are color, fracture, flow bubbles, softness, = association with other volcanic rocks and lack of crystal faces. Mark ------=_NextPart_000_02CA_01C29E9C.0549BAC0 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>I should have added obsidian to my list for=20 comparisons:</FONT></DIV><FONT size=3D2> <UL> <LI><B>Color</B> is dark green to dark brown and black, also can show = sheens=20 of gold or green, yellow, blue and/or purple coloration. Sometimes = with white=20 inclusions (Snowflake Obsidian).=20 <LI><B>Luster</B> is vitreous.=20 <LI><B>Transparency:</B> Obsidian is translucent in any stone of = appreciable=20 size.=20 <LI><B>Crystal System</B> does not apply because obsidian is <B><M=20 href=3D"/minerals/symmetry/amorphou.htm">amorphous</M>.</B>=20 <LI><B>Habits</B> include compact nodules or as massive layers between = other=20 volcanic rocks=20 <LI><B>Fracture</B> is conchoidal.=20 <LI><B>Hardness</B> is <FONT color=3D#ff0000><B>5 - 5.5</B></FONT> = (much softer=20 than quartz).=20 <LI><B>Specific Gravity</B> is approximately <FONT=20 color=3D#ff0000><B>2.6</B></FONT> (average)=20 <LI><B>Streak</B> is white.=20 <LI><B>Other Characteristics:</B> Generally lacks open voids or large = bubbles=20 like other volcanic rocks.=20 <LI><B>Notable Occurrences</B> include Italy; Mexico; Scotland; = Arizona,=20 Colorado, Texas, Utah and Idaho, USA.=20 <LI><B>Best Field Indicators</B> are color, fracture, flow bubbles, = softness,=20 association with other volcanic rocks and lack of crystal = faces.</LI></UL> <DIV> </DIV> <DIV> </DIV> <DIV>Mark</DIV></FONT></BODY></HTML> ------=_NextPart_000_02CA_01C29E9C.0549BAC0-- Received on Sun 08 Dec 2002 12:27:26 PM PST |
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