[meteorite-list] Crystals in Lunar Meteorites...?

From: Thunder Stone <stanleygregr_at_meteoritecentral.com>
Date: Wed, 29 Dec 2010 16:19:47 -0800
Message-ID: <SNT117-W338F41680A3EB2D8810B2DD2030_at_phx.gbl>

Thank you Larry - Sometimes you just can't get your thoughts to the fingertips.

Greg S.

----------------------------------------
> To: stanleygregr at hotmail.com; meteorite-list at meteoritecentral.com
> Subject: Re: [meteorite-list] Crystals in Lunar Meteorites...?
> Date: Wed, 29 Dec 2010 18:51:46 -0500
> From: thetoprok at aol.com
>
>
> Hi Greg, Randy, List,
>
> I have been wondering the same thing since I've recently cut a few of
> my lunar suspects recently. To put Greg's question a little different,
> do lunar meteorites ever have crystaline shapes? Can you see with the
> naked eye or a loupe actual crystal structures like 6 sided or 8 sided
> crystals?
>
> Sincerely,
> Larry Atkins
> IMCA # 1941
> Ebay username alienrockfarm
> www.poisonivycontrolofmichigan.com
>
>
> -----Original Message-----
> From: Thunder Stone
> To: korotev at wustl.edu; meteorite-list at meteoritecentral.com
> Sent: Wed, Dec 29, 2010 11:55 am
> Subject: Re: [meteorite-list] Crystals in Lunar Meteorites...?
>
>
> Thanks Randy:It does to some degree and thanks for the links.I keep
> reading that lunar rocks contain "clasts," which I interpret as a
> grouping of crystals mashed together from a previous rock, and not
> individual crystals. I also read "grains" too.Let me put it another
> way: Do lunar rocks ever contain large crystals of feldspar or pyroxene
> like you may see in granite or a pegmetite? I unfortunately only have
> one very small lunar and have only seen others briefly.I'm convinced if
> a lunar has lost its fusion crust - it would be very difficult to
> identify when found.Greg S.---------------------------------------->
> Date: Wed, 29 Dec 2010 13:05:38 -0600> To:
> meteorite-list at meteoritecentral.com> From: korotev at wustl.edu> Subject:
> Re: [meteorite-list] Crystals in Lunar Meteorites...?>> Greg:>> All
> lunar meteorites contain mineral crystals. The basalts (both> breccias
> and unbrecciated) are composed mainly of crystals of> pyroxene and
> plagioclase feldspar. Some contain olivine, and all> contain minor
> ilmenite and related iron-titanium minerals. The> feldspathic breccias
> are largely crystalline. The only> noncrystalline material is glass and
> a little metal. "Crushed rock"> is crushed crystalline material. In
> some lunar meteorites the> plagioclase has been shock converted to
> maskelynite which,> technically, isn't a crystal but more like glass.>>
> Put another way, in photomicrographs of lunar meteorites (or any> rock)
> under "cross-polarized light" (NOT "plane polarized light") or>
> "crossed nichols," any and all non-black material is crystalline.>>
> There are some here:>>
> http://curator.jsc.nasa.gov/antmet/PDFFiles/B07_LAP02205v3.pdf < basalt
> >> http://curator.jsc.nasa.gov/antmet/PDFFiles/F23_GRA06157v3.pdf <>
> feldspathic breccia >>
> http://curator.jsc.nasa.gov/antmet/PDFFiles/F24_LAR06638v3.pdf <>
> feldspathic breccia >>
> http://curator.jsc.nasa.gov/antmet/PDFFiles/M07_MET01210v3.pdf <>
> basaltic breccia >>> Does this answer your question?>> Randy
> Korotev>>>>>>> At 11:59 AM 2010-12-29 Wednesday, you wrote:>> >List:>
> >> >I hope everyone had a prosperous and joyful Holiday Season.> >> >I
> was wondering something:> >> >Do lunar meteorites ever contain
> crystals? Or are the just crushed> >rock and lunar soil compacted
> together? From what I've been able to> >find is that any basalt type
> rock containing white feldspar that are> >crystals or if there is
> opaque crystals (ilmenite or> >magnetite...etc.), then it cannot be
> lunar, is this true? Are there> >some cases where you could find
> crystals within a lunar rock?> >> >Much Thanks and everyone have a
> happy New Year.> >> >Greg S.> >>
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Received on Wed 29 Dec 2010 07:19:47 PM PST