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444.6g Diogenite I Beautiful HED Meteorite Fragment from Vesta

Top Meteorite

  • $ 8,300.00


On Offer: 444.6g fragment of a Diogenite HED achondrite meteorite
Official name: NWA 12931
Type: Diogenite
Parent Body: Vesta or associated Vestoid
Description: 444.6 gram fragment of an amazing unclassified diogenite with extensive green pyroxene crystals and black chromite crystals dispersed throughout the 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: 444.6 gram diogenite meteorite specimen as shown, & signed Certificate of Authenticity.
I offer a 100% no questions asked 30 day return policy.
Northwest Africa 12931
Basic information Name: Northwest Africa 12931
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12931
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 2.06 kg
Meteoritical Bulletin:   Meteorit. Planet. Sci. 55, 1146-1150">MB 108   (2020)   Diogenite
Recommended:   Diogenite    [explanation]

This is 1 of 481 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 21 Nov 2019
Writeup from MB 108:

Northwest Africa 12931 (NWA 12931)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Diogenite)

History: Purchased Nov 2016 by Dustin Dickens in Mauritania from anonymous dealer.

Physical characteristics: Single stone with desert weathered exterior. Saw cut and broken surfaces reveal a light-colored interior. Friable.

Petrography: (C. Agee, UNM) This meteorite is an equilibrated orthopyroxenite with ~95% pyroxene, and minor amounts of silica, chromite and troilite. No olivine or plagioclase were detected.

Geochemistry: (C. Agee, UNM) Low-Ca pyroxene Fs27.5±0.3Wo3.6±0.3, Fe/Mn=26±1, n=12.

Classification: Diogenite

Specimens: 21.6 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase: Mauritania
Date: P 2016
Mass (g): 2061
Pieces: 1
Class: Diogenite
Shock stage: moderate
Weathering grade: moderate
Ferrosilite (mol%): 27.3±0.6
Wollastonite (mol%): 3.6±1.0
Classifier: C. Agee, UNM
Type spec mass (g): 21.6
Type spec location: UNM
Main mass: Dustin Dickens
Comments: Field name DD-56; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

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