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Howardite Meteorite Slice 20g I NWA 11899 I Beautiful HED Slice

Brought to you by: Top Meteorite

  • $ 400.00


 

On Offer: 20g slice of NWA 11899 Howardite HED meteorite
Type: Howardite
Parent Body: Vesta or Vestoid
Description: 20 gram beautiful full slice of NWA 11899 with some crust.
Dimensions: approx. 67.6mm x 44mm x 3.44mm 
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 meteorites with distinct chemistries, while the Howardite is a mix of the Eucrite and Diogenite material. The HEDs are differentiated achondritic meteorites, thought to originate from the large differentiated asteroid 4 Vesta. The Vesta parent body origin for the HED clan is considered to have been conclusively established for many years. However, some leading researchers are now starting to suspect they originated from a larger Vesta-like asteroid that was blown apart long ago. This is because we also find a class of iron meteorites with the exact isotopic genetics as the HED clan, leading some researchers to conclude the HED meteorites come from a larger Vestan-like body that was in a cataclysmic collision that liberated part or all of its metal core. This hypothesis does not rule out the possibility that all of the material including Vesta and the Vestoids and the HED meteorites were once part of a much larger dwarf planet prior to this collision. 
What you get: 20 gram slice of Howardite meteorite NWA 11899 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 11899
Basic information Name: Northwest Africa 11899
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11899 
Observed fall: No
Year found: 2017
Country: Mali 
Mass:help 16 kg
Classification
  history:
Recommended:   Howardite    [explanation]

This is 1 of 356 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 31 Aug 2018
Writeuphelp
Writeup from MB 107: 

Northwest Africa 11899 (NWA 11899)

Mali

Purchased: 2017

Classification: HED achondrite (Howardite)

History: Purchased by Dustin Dickens from Nomad in Mali.

Physical characteristics: Many identically appearing pieces. Fusion crusted exterior. A saw cut reveals a breccia with light and dark clasts set in light-brown matrix.

Petrography: (C. Agee, UNM) This meteorite is a polymict breccia consisting of approximately 60% diogenite and 40% eucrite clasts. Accessory Fe-Ni metal, Fe-sulfide, and silica observed.

Geochemistry: (C. Agee, UNM) diogenite low-Ca pyroxene Fs25.1±2.5Wo3.6±2.2, Fe/Mn=30±2, n=10; eucrite low-Ca pyroxene Fs49.7±5.2Wo4.8±2.8, Fe/Mn=29±2, n=7;.plagioclase AN93.1±1.2, n=7.

Classification: Howardite

Specimens: 22.8 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase: Mali
Date: P 2017
Mass (g): 16000
Pieces: Many
Class: Howardite
Shock stage: high
Weathering grade: low
Ferrosilite (mol%): 25.1±2.5, 49.7±5.2
Wollastonite (mol%): 3.6±2.2, 4.8±2.8
Classifier: C. Agee, UNM
Type spec mass (g): 22.8
Type spec location: UNM
Main mass: Dustin Dickens
Comments: Field name DD-26; submitted by C. Agee, UNM
ID - NWA118991801

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