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On Offer: 126.9 gram winonaite primitive achondrite meteorite

Official name: NWA 13790

Class: Winonaite - primitive achondrite

Origin: Northwest Africa

Year found: 2020

Description: 126.9 gram Primitive Achondrite Winonaite Meteorite with official name NWA 13790. The winonaite class has been connected to the IAB iron meteorite parent body, which seems to support the idea that these two very different meteorites come from different parts of the same partially differentiated asteroid that was broken up and reformed after a massive collision. The primitive achondrites as a whole are thought to represent a transitional phase between chondrites and achondrites.

What you get: 126.9g Winonaite Meteorite NWA 13790 as shown, and signed Certificate of Authenticity.

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Northwest Africa 13790

Basic information

Name: Northwest Africa 13790
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13790
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 838 g

Classification
history:

Recommended:

Winonaite

This is 1 of 85 approved meteorites (plus 1 unapproved name) classified as Winonaite.
Search for other: Primitive achondrites, Winonaites

Comments:

Approved 28 Mar 2021

Writeup

Writeup from MB 110:

Northwest Africa 13790 (NWA 13790)

(Northwest Africa)

Purchased: 2020 Nov

Classification: Primitive achondrite (Winonaite)

Physical characteristics: Some fragments have fusion crust. The main mass is 131.4 g.

Petrography: (K. Metzler, IfP) Coarse-grained mafic rock, consisting of olivine (~45 vol%), low-Ca pyroxene (~10 vol%), Ca-rich pyroxene (~20 vol%), plagioclase (~10 vol%), Fe-Ni metal (~15 vol%), and small amounts of troilite. Olivine grains with reverse chemical zoning (Mg-rich reduction rims) occur. Metal occurs as isolated grains and as veins up to several cm in length. The rock shows a metamorphic texture with frequent 120° triple junctions at crystal boundaries and partly poikilitic intergrowths. Typical grain sizes vary between 100 and 500 µm. However, cm-sized areas of olivine and pyroxene, respectively, show identical optical orientation.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa_3.4±0.6(Fa_2.0-4.1; n=15); Fe/Mn (at.): 15.8. The mean low-Ca pyroxene composition is Fs_4.4±0.3Wo_1.9±0.2(Fs_3.9-5.0Wo_1.6-2.2; n=15); Fe/Mn (at.): 12.6. The mean composition of Ca-rich pyroxene is Fs_1.3±0.3Wo_43.8±0.6(Fs_0.9-2.2Wo_42.9-45.1; n=15); Fe/Mn (at.): 10.7. The mean feldspar composition is An_20.9±0.7Or_3.0±0.5(An_19.9-22.1Or_2.1-3.8; n=10).

Classification: Winonaite, based on the mineral chemistry and the high abundance and shape of Fe-Ni metal.

Specimens: Main mass with Ben Hoefnagels. 180 g (14 pieces) with Mohamed Ali Loud.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Nouadhibou, Mauritania
Date:	P 2020 Nov
Mass (g):	838
Pieces:	27
Class:	Winonaite
Shock stage:	M-S1
Weathering grade:	Low
Fayalite (mol%):	3.4±0.6
Ferrosilite (mol%):	4.4±0.3; 1.3±0.3
Wollastonite (mol%):	1.9±0.2; 43.8±0.6
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Ben Hoefnagels
Comments:	Submitted by K. Metzler, IfP