Meteorite - Howardite - Clast-rich polymict breccia - NWA 14641 - full slice

Description

On offer is a complete slice from
NWA 14641;
a
clast-rich polymict breccia
classified as a
Howardite
with a
"
a great diversity of mineral and lithic fragments
".
The slice is polished nicely on side.
Weight: 8.43 grams
This
specimen comes with a signed
COA
and a
protection box
We offer combined shipping
We are a
Global Meteorites Association
trusted
member
#
G0064
Official entry in the Meteorites database bulletin :
Northwest Africa 14641
Basic information
Name:
Northwest Africa 14641
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 14641
Observed fall:
No
Year found:
2021
Country:
(Northwest Africa)
Mass:
840 g
Classification
history:
Recommended:
Howardite
[explanation]
This is 1 of 418 approved meteorites classified as Howardite.
[show all]
Search for other:
Achondrites
,
HED achondrites
, and
Howardites
Comments:
Approved 19 Mar 2022
Writeup
Writeup from MB 111:
Northwest Africa 14641
(NWA 14641)
Howardite, (Northwest Africa)
Purchased: 2021 Sept
Classification: HED achondrite (Howardite)
History
: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania in September, 2021.
Physical characteristics
: Light grayish rock with some fusion crust.
Petrography
: The meteorite is a clast-rich polymict breccia with a great diversity of mineral and lithic fragments set into a fine-grained clastic groundmass. Lithic fragments are up to 2 cm sized basaltic and black impact melt clasts. Predominant minerals are Fe-rich low-Ca pyroxenes with augite exsolution lamellae, diogenetic low-Ca pyroxene (about 30 vol%), ferroan unexsolved low-Ca pyroxene, zoned low-Ca pyroxene, olivine, and calcic plagioclase all with variable grain sizes. Diogenetic low-Ca pyroxenes are up to 2 mm in size. Minor phases include silica, Ti-poor chromite, ilmenite, and FeS. Metallic iron was not detected.
Geochemistry
: low-Ca pyroxene host to augite exsolution lamellae: Fs
55.0±0.4
Wo
2.3±0.6
(Fs
54.0-55.5
Wo
1.8-3.6
, FeO/MnO=27-30, n=7); augite exsolution lamellae: Fs
26.5±0.3
Wo
37.9±0.4
(Fs
25.9-27.0
Wo
37.4-38.6
, FeO/MnO=25-30, n=7); diogenetic low-Ca pyroxene: Fs
30.2±0.4
Wo
2.7±0.6
(Fs
29.6-30.8
Wo
1.8-3.6
, FeO/MnO=29-30, n=7); ferroan low-Ca-pyroxene: Fs
42.1±0.2
Wo
1.9±0.1
(Fs
41.7-42.4
Wo
1.8-2.0
, FeO/MnO=26-28, n=7); zoned low-Ca-pyroxene: Fs
25.6±2.5
Wo
1.8±0.1
(Fs
22.8-29.2
Wo
1.7-1.8
, FeO/MnO=27-29, n=7); olivine: Fa
42.8±0.2
(Fa
42.6-43.1
, FeO/MnO=46±1, n=7); calcic plagioclase: An
90.5±0.3
(An
90.1-90.8
, n=4)