[meteorite-list] Greg Hup é 's gorgeous NWA 4883 eucrite ...

[Michael L Blood]

Christmas Geetings, Bernd,
        Kan't you give us a photo link, now that you have us
All tripping over our tongues?
        Best wishes, Michael

on 12/20/07 5:36 AM, bernd.pauli at paulinet.de at bernd.pauli at paulinet.de
wrote:


> .. arrived today and I must tell you that it is out-of-this-world! My

> 11.9-gram endcut

> can keep you busy for hours!!! Its dark-brown crust still shows traces of

> black, glossy

> fusion crust and the abundant colorless, pale bluish or even pale greenish but

> *limpid*

> maskelynite crystals clearly testify to its intense shock history.

> 

> This complex, polymict eucrite breccia shows all kinds of clasts but the most

> exotic

> feature of my endcut is what only two of the pieces showed and what Stefan

> Brandes so

> aptly described as a "cosmic spider web":

> 

> These elongated, acicular (augite?) crystals have an average length of 0.7 mm

> but some

> are longer than 1 mm and some are arranged in a star-like pattern with up to

> nine or ten

> elongate crystals radiating from a central point or "nucleus".

> 

> Troilite is present in some places and this endcut also sports a medium-gray

> angular,

> lithic clast measuring a whopping 5.5 mm in longest dimension. Under the

> microscope

> it is "marbly" in appearance.

> 

> Furthermore there are a few tiny specks of (Ni-free) metal and another oddity

> is this:

> 

> One translucent maskelynite crystal measuring 0.9 mm contains numerous,

> milky-white

> very small (length ca. 0.05 mm) worm-like features (almost like rice grains)

> that are

> reminiscent of air bubbles caught in frozen water while trying to ascend to

> the surface! 

> 

> What a meteorite!

> 

> Take care,

> 

> Bernd

> 

> 

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