[meteorite-list] Ad, Sale. newly classified Howardite

From: Steve Witt <stelor96_at_meteoritecentral.com>
Date: Thu, 20 Nov 2014 00:55:58 +0000 (UTC)
Message-ID: <1905917263.260645.1416444958641.JavaMail.yahoo_at_jws10646.mail.bf1.yahoo.com>

Greetings all,

I'd like to announce NWA 8615, a new Howardite that I purchased earlier this year and was just recently classified. Carl Agee describes it as
Two matching stones, weathered exterior with some caliche. A saw-cut reveals a breccia of light and dark clasts set in dark brown matrix.

Petrography: (C. Agee, UNM)
Microprobe examination of a polished mount shows a highly brecciated texture with ~50% diogenitic pyroxenes, ~25% gabbroic eucrite pyroxenes
showing Fe zoning, and ~25% equilibrated basaltic eucrite clasts showing clear separation between augite and pigeonite, with coarse exsolution
lamellae. Accessory Fe-Ni metal, troilite, Ti-rich chromite, chromite, and ilmenite throughout.

Geochemistry: (C. Agee and N. Muttik, UNM) Diogenite orthopyroxene Fs28.8?6.2Wo2.4?1.4, Fe/Mn=34?6, n=10; gabbroic eucrite low-Ca pyroxene Fs47.1?3.7Wo4.7?3.7, Fe/Mn=36?6, n=8, basaltic eucrite augite Fs44.3?11.0Wo27.0?12.6, Fe/Mn=34?1, n=3; basaltic eucrite pigeonite Fs62.9?1.2Wo6.6?1.9, Fe/Mn=33?2, n=3; plagioclase An89.3?2.5Ab10.2?2.3Or0.5?0.2, n=6.

Classification: Achondrite
(howardite) with three lithologies: 1) diogenite, 2) unequilibrated gabbroic eucrite with zoned pyroxenes, 3) equilibrated basaltic eucrite.

TKW is only 109 grams, so after type specimen and cut loss, there is only a small amount of this material available. I've listed 10 pieces tonight and will list a dozen or so more tomorrow. Free shipping on orders over $100. I have put photos on Flickr. In the past I have marked sold specimens in the description. This has created some confusion. From now on, as items sell, I will remove the picture of the sold specimens. Price is $20 per gram for a limited time. See:

https://www.flickr.com/photos/stevewitt/sets/72157648967596398/

Please also check out my other albums with specimens for sale here:

https://www.flickr.com/photos/stevewitt/sets

thanks for your time,
Steve


Steve Witt
IMCA #9020
http://imca.cc/
Received on Wed 19 Nov 2014 07:55:58 PM PST