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54.5g Diogenite HED Meteorite fragment I NWA 7977

Brought to you by: Top Meteorite

  • $ 540.00


On Offer: 54.5g fragment of NWA 7977 Diogenite HED meteorite
Type: Diogenite
Location: Northwest Africa
Composition: Pyroxenite
Parent Body: Vesta or Vestoid
Description: 54.5 gram fragment of an amazing diogenite HED meteorite displaying extensive green pyroxene crystals that comprise the majority of this exceptional meteorite.
The HED Meteorites: The HED meteorite group is so named for the three types of meteorites that comprise the group; Howardite, Eucrite and Diogenite. The Eucrite and Diogenite are distinct meteorites, while the Howardite is a mix of the Eucrite and Diogenite lithologies. The HEDs are differentiated achondritic meteorites previously thought to originate from Vesta, but now leading researchers are starting to think they originated from a Vesta-like asteroid (not Vesta itself) that was destroyed long ago. This is because we also find iron meteorites with similar isotopic genetics as the HED, leading researchers to conclude the HED meteorites come from a large Vestan-like body that was in a large enough collision to also liberate pat or all of its metal core.
What you get: 54.5 NWA 7977 diogenite meteorite specimen as shown, membrane storage/display box, & signed Certificate of Authenticity.
I offer a 100% no questions asked 30 day return policy.
Northwest Africa 7977
Basic information Name: Northwest Africa 7977
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7977
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 3.4 kg
Meteoritical Bulletin:   MB 102   (2013)   Diogenite
Recommended:   Diogenite    [explanation]

This is 1 of 442 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 12 Sep 2013
Writeup from MB 102:

Northwest Africa 7977 (NWA 7977)


Purchased: 2013

Classification: HED achondrite (Diogenite)

History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to Sean Tutorow for classification, 2012.

Physical characteristics: Numerous matching fragments of the original mass, friable with coarse grained gemmy green pyroxenes, some light tan desert coating present.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 95% pyroxene, minor iron metal, chromite, troilite, and silica.

Geochemistry: (C. Agee and N. Muttik, UNM) Low Ca-pyroxene Fs28.4±0.3Wo3.5±0.7, Fe/Mn=29±1 n=14.

Classification: Achondrite (diogenite). Equilibrated, uniform pyroxene compositions.

Specimens: Two pieces, 33.75 g and 22.1 g, including a probe mount, on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase: Morocco
Date: P 2013
Mass (g): 3403
Pieces: Many fragments
Class: Diogenite
Ferrosilite (mol%): 28.4±0.3
Wollastonite (mol%): 3.5±0.7
Classifier: C. Agee, UNM
Type spec mass (g): 55.8
Type spec location: UNM
Main mass: Sean Tutorow
Comments: Field name G-382; submitted by C. Agee

ID - NWA797720_54.5_01

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