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21.93g Lunar Gabbro Meteorite Specimen I NWA 6950

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  • $ 4,385.00



On offer:
21.93g rare lunar gabbro meteorite 

Official name: NWA 6950

Classification: Lunar (gabbro)

Mass: 21.93g

Classification: Lunar (gabbro)

Description: This is a 21.93 gram end cut of a lunar meteorite that was ejected from the Moon's surface when another meteorite struck that area of the Moon with enough force to send pieces into an Earth crossing trajectory. This specimen is unlike many of the lunar feldspathic breccia that are more common among the lunar meteorites types, and instead shows an igneous phaneritic texture with large slow cooled crystal structures. It is a stunning lunar meteorite with pronounced long well-defined glassy shock veins, fusion crust, and a beautiful interior with green phenocrysts.

What you get: 21.93 gram specimen of the lunar meteorite NWA 6950 as shown, signed certificate of authenticity.

 

 

OFFICIAL METEORITICAL SOCIETY ENTRY BELOW

Northwest Africa 6950
Basic information Name: Northwest Africa 6950
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6950
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 1649 g
Classification
  history:
Meteoritical Bulletin:   MB 100   (2012)   Lunar (gabbro) 
Recommended:   Lunar (gabbro)   [explanation]

This is 1 of 10 approved meteorites classified as Lunar (gabbro).  [show all]
Search for other: Lunar meteorites
Comments: Approved 16 Dec 2011
Revised 29 Jan 2012: revised mass
Writeuphelp
Writeup from MB 100:

Northwest Africa 6950 (NWA 6950)

(Northwest Africa)

Purchased: 2011 Aug

Classification: Lunar meteorite (gabbro)

History: Reported to be found near the border between Mali and Algeria in June 2011, and purchased from the finder by Adam Aaronson in August 2011.

Physical characteristics: A single yellowish-green stone (1649 g, broken into 8 pieces) with partial fusion crust. Thin black shock veins are visible in the interior.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively coarse grained with a cumulate igneous texture. Aggregate dominated by olivine, low-Ca pyroxene, pigeonite, and subcalcic augite, with interstitial very calcic plagioclase. Accessory minerals are ilmenite, Ti-chromite, armalcolite, troilite, baddeleyite, taenite and merrillite with rare zirconolite and K-feldspar.

Geochemistry: Olivine (Fa31.9-32.7, Fe/Mn=85-97), low-Ca pyroxene (Fs27.1-28.1Wo4.8-4.5, Fe/Mn=47-55), pigeonite (Fs25.6±0.0Wo9.2-11.1, Fe/Mn=47-52), subcalcic augite (Fs13.9Wo36.9, Fe/Mn=41), plagioclase (An87.9-93.0Or1.1-0.9).

Classification: Achondrite (lunar, gabbro). This specimen is texturally and mineralogically identical to NWA 2977 and the olivine gabbro clasts in NWA 773, NWA 2700, NWA 2727 and NWA 3333, and evidently is paired with those stones.

Specimens: A total of 20.1 g of sample and one polished thin section are on deposit at UWS. The main mass is held by Aaronson.

Data from:
  MB100
  Table 1
  Line 1551:
Place of purchase: Temara
Date: P 2011 Aug
Mass (g): 1649
Pieces: 1
Class: Lunar (gabbro)
Shock stage: moderate
Weathering grade: very low
Fayalite (mol%): 31.9-32.7
Ferrosilite (mol%): 27.1-28.1; 25.6±0.0; 13.9
Wollastonite (mol%): 4.8-4.5; 9.2-11.1; 36.9
Classifier: A. Irving and S. Kuehner, UWS
Type spec mass (g): 20.1
Type spec location: UWS
Main mass: Aaronson
Comments: Submitted by A. Irving

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