2.5g HED Achondrite Meteorite I Amazing Howardite Slice

Top Meteorite

$126.00

On Offer: 2.5 gram end slice of the amazing HED achondrite howardite meteorite.

Type: HED Howardite

Description: 2.5 gram partial slice of HED howardite with a mix of approximately 65% eucritic material and 35% diogenitic material. Fusion crust can be seen on the outer part of the slice in two of the three sides of the slice.

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: 2.5g Howardite meteorite specimen as shown, shipping/storage membrane box & signed Certificate of Authenticity.

We offer a 100% no questions asked 30 day return policy.

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Northwest Africa 15795

Basic information

Name: Northwest Africa 15795
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15795
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass: 343 g

Classification
history:

Meteoritical Bulletin:	MB 112	(2024)	Howardite
Recommended:			Howardite [explanation]

This is 1 of 462 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, , and

Comments:

Approved 29 May 2023

Writeup

Writeup from MB 112:

Northwest Africa 15795 (NWA 15795)

(Northwest Africa)

Purchased: 2021 Apr

Classification: HED achondrite (Howardite)

History: The meteorite was purchased in Mali by Mr. A. Selek in April of 2021 and sent to Mr. D. Dickens via post soon after. A piece of the stone was subsequently cut and sold by Mr. Dickens to Mr. D. Lorenzen along with a repository donation mass for classification.

Physical characteristics: One rock completely covered in black fusion crust.

Petrography: The meteorite is a complex polymict breccia composed of lithic and mineral clasts set into a fine-grained clastic matrix of related material. Lithic clasts are up to 2 cm sized diogenitic, up to 1.5 cm sized basaltic, and up to 6 mm sized dark impact melt clast. Predominant minerals are up to 1 mm sized diogenetic orthopyroxene (about 30%), ferroan low-Ca pyroxene, compositionally zoned low-Ca pyroxene, exsolved pyroxene and calcic plagioclase. Minor phases include silica, chromite, ilmenite, FeS, and metallic iron.

Geochemistry: diogenetic pyroxene: Fs_25.5±0.2Wo_3.0±0.7(Fs_25.2-25.8Wo_1.7-3.7, FeO/MnO=23-28, n=10); ferroan low Ca-pyroxene: Fs_43.9±0.7Wo_1.9±0.9(Fs_42.7-44.8Wo_1.0-3.6, FeO/MnO=27-31, n=10); zoned low-Ca pyroxene: Fs_43.4±10.0Wo_3.5±2.0(Fs_27.4-52.9Wo_1.3-8.0, FeO/MnO=28-34, n=10); low-Ca pyroxene host to augite exsolution lamellae: Fs_52.0±0.3Wo_1.5±0.1(Fs_51.7-52.2Wo_1.4-1.5, FeO/MnO=27-29, n=10); augite exsolution lamellae: Fs_19.6±0.6Wo_44.7±0.7(Fs_18.6-20.8Wo_43.7-45.7, FeO/MnO=23-28, n=10); calcic plagioclase: An_84.5±3.3(An_79.8-90.4, n=12)

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Mali
Date:	P 2021 Apr
Mass (g):	342.7
Pieces:	1
Class:	Howardite
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	25.5;43.9; 43.4; 52.0; 19.6
Wollastonite (mol%):	3.0; 1.9; 3.5; 1.5; 44.7
Classifier:	A. Greshake, MNB
Type spec mass (g):	20
Type spec location:	MNB
Main mass:	Mr. Dustin Dickens
Comments:	Submitted by Ansgar Greshake

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