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Ungrouped Achondrite Meteorite Slice 41.4g | NWA 6704

Brought to you by: Top Meteorite

  • $ 2,070.00


 

On Offer: 41.4 gram Ungrouped Achondrite beautiful slice of NWA 6704
Type: Achondrite - ung (Ungrouped)
Official name: NWA 6704
Description: 41.4 gram large slice of the Ungrouped Achondrite NWA 6704. Amazing space crystals from a meteorite with unknown origins. This meteorite comes from a large unknown differentiated body, where the magma reservoir that created it was able to cool very slowly and form large pyroxene and olivine crystals. 
What large parent body was it? Not mars, not the Moon, not Vesta, and not any of the undifferentiated asteroids. So where from then? They just don't know. It defies any of the existing taxonomical categories, and hence the classification Achondrite Ungrouped. An ungrouped meteorite is very different than an unclassified meteorite. This meteorite has been fully analyzed and classified but defies existing classification schemas and therefor has been designated "ungrouped".
This specimen comes with impeccable provenance. This slice comes directly from the Hupe Collection. I personally traded with Greg Hupe for this and several others slices and fragments during the 2018 Tucson show. 
What you get: 41.4 gram slice of the Ungrouped Achondrite NWA 6704 Meteorite Specimen as Shown, Membrane Storage/Display Box, & signed Certificate of Authenticity.
I offer a 100% no questions asked 30 day return policy.
SEE OFFICIAL METEORITICAL SOCIETY ENTRY BELOW
Northwest Africa 6704
Basic information Name: Northwest Africa 6704
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6704 
Observed fall: No
Year found: unknown
Country: Algeria 
Mass:help 8.39 kg
Classification
  history:
Meteoritical Bulletin:   MB 99   (2011)   Achondrite-ung
Recommended:   Achondrite-ung    [explanation]

This is 1 of 83 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 17 May 2011
Revised 11 Mar 2012: Updated mass
Writeuphelp
Writeup from MB 99: 

Northwest Africa 6704 (NWA 6704)

Algeria

Purchased: Jan-May 2011

Classification: Ungrouped achondrite

History: A single, dense, yellowish-green stone was found in pieces in Algeria, and was purchased in February 2011 at the Tucson Gem and Mineral Show and over subsequent weeks from Moroccan dealers by Greg Hupé.

Physical characteristics: The reassembled 42 pieces (plus some granular debris) fit together as a single ovoid mass (8387 g) with rounded, shiny exterior surfaces and small patches of remnant black fusion crust. The very fresh interior is mostly pale yellowish green with sporadic darker brownish grains and sparsely distributed tiny grains of opaque oxide and silvery metal.

Petrography: (A. Irving and S. Kuehner, UWS): Overall medium grained with an igneous cumulate texture. Small grains of olivine (0.5-0.8 mm) and chromite (0.1-0.6 mm) enclosed within large (to 4 mm) orthopyroxene oikocrysts, which are in turn surrounded by large optically continuous, intercumulus grains of untwinned albite and <0.1 mm awaruite. The silicates contain curvilinear trains of tiny rounded inclusions (2-20 μm), which appear on polished surfaces to be empty bubbles with smooth rounded walls.

Geochemistry: Olivine (Fa51.6-53.2; FeO/MnO=120-140; NiO=0.9-1.0 wt.%), orthopyroxene (Fs41.6-42.4Wo2.8-3.6, FeO/MnO=81-82; Cr2O3=0.3 wt.%), plagioclase (Ab92-93An4-3Or4). Oxygen isotopes (R. Tanaka, OkaU): replicate analyses of acid-washed material by laser fluorination gave: δ17O 1.015, 0.880; δ18O 3.922, 3.613; Δ17O -1.048, -1.020 per mil.

Classification: Achondrite (ungrouped). This specimen is unlike other achondrites in its combined features: relatively ferroan mafic silicate minerals with elevated FeO/MnO ratios and anomalous Ni contents, extremely sodic plagioclase, very Ni-rich metal, and oxygen isotopic composition that plots within the field for acapulcoites-lodranites. Weathering is low and limited to minor coatings of pale orange desert dust on broken surfaces. Unshocked.

Specimens: A total of 20.5 g of type material and two polished thin sections are on deposit at UWS. The remaining material is held by GHupé.

Data from:
  MB99
  Table 0
  Line 0:
Place of purchase: Tucson and Morocco
Date: P 2011 Jan-May
Mass (g): 8387
Pieces: 42
Class: Achondrite-ung
Shock stage: low
Weathering grade: low
Fayalite (mol%): 51.6-53.2
Ferrosilite (mol%): 41.6-42.4
Wollastonite (mol%): 2.8-3.6
Classifier: A. Irving and S. Kuehner, UWS
Type spec mass (g): 20.5
Type spec location: UWS
ID: NWA67041902

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