Meteorite NWA 13370 - Howardite (mix of Eucritic and Diogenitic materials)

Description

NWA 13370
NWA 13370
Found 2019
Achondrite (HED)
Howardite
Specimen is a 1.72g slice
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Howardites
are achondritic stony meteorites that originate from the surface of the asteroid 4-Vesta. They are the less common variety of the HED meteorite clan.
They are a regolith breccia, consisting mostly of eucrite and diogenite fragments, although carbonaceous
chondrules (exogenous)
and impact melt can also occur in howardite. The rock formed from impact ejecta which was later buried by newer impacts, and lithified due to the pressure from overlying layers.
In NWA 13370 lithic clasts are :
cumulate and equilibrated basaltic eucrite; diogenite (including a poikilitic diogenite) and a highly magnesian olivine-orthopyroxene lithology (Fa5-Fs13Wo0.3); and several shock-melted clasts (melt breccia - total melt). Eucritic pyroxenes are exsolved. Additional minerals are olivine chromite, ilmenite, troilite, plagioclase, Fe metal grains and a silica polymorph.
Northwest Africa 13370
Basic information
Name:
Northwest Africa 13370
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 13370
Observed fall:
No
Year found:
2020
Country:
Morocco
Mass:
312 g
Classification
history:
Recommended:
Howardite
Comments:
Approved 2 Aug 2020
Writeup
Writeup from MB 109:
Northwest Africa 13370
(NWA 13370)
Morocco
Purchased: 2020
Classification: HED achondrite (Howardite)
History
: In February of 2020, Fabien
Kuntz
purchased two stones with a total weight of 311.8 g from a meteorite prospector in Guelmim, Morocco.
Physical characteristics
: A sample from each stone was submitted for classification. Both stones have a dark-brown, wind-ablated exterior. Clasts are visible on the exterior. The cut face shows sample is a breccia with visible orthopyroxene clasts, lithic clasts up to 2 mm and flecks of Fe metal.
Petrography
: Description and Classification (A. Love,
App
) Sample is composed of (vol %): angular to rounded lithic clasts of eucrite (70) and diogenite (30) and similar mineral fragments set within a comminuted matrix of these materials. Lithic clasts are: cumulate and equilibrated basaltic eucrite; diogenite (including a poikilitic diogenite) and a highly magnesian olivine-orthopyroxene lithology (Fa
5-
Fs
13
Wo
0.3
); and several shock-melted clasts (melt breccia - total melt). Eucritic pyroxenes are exsolved. Additional minerals are olivine chromite, ilmenite, troilite, plagioclase, Fe metal grains and a silica polymorph.
Geochemistry
: (A. Love,
App
) Diogenite: orthopyroxene (Fs
26.0±5.1
Wo
1.7±1.1
, Fe/Mn=32.2±4.1, n=12); Olivine, Fa
25.2±14.8
(Fa
5.6-47.7
, Fe/Mn=40.6±6.8, n=9). Eucrite: low-Ca pyroxene (Fs
52.7±10.0
Wo
3.2±1.2
, Fe/Mn=29.4±1.4, n=5); pigeonite (Fs
42.7-49.7
Wo
8.9-12.1
, N=2); high-Ca pyroxene (27.5±7.0Wo
40.8±2.2
, n=5); plagioclase (An
93.1±2.4
Or
0.2±0.1
, n=6).
Classification
: HED achondrite (howardite). Based on texture, modal abundances, unequilibrated mineral compositions, Fe/Mn and Mg# of orthopyroxenes and olivines, this sample is a howardite with a shock stage corresponding to M-S2 and low weathering grade.
Specimens
:
Kuntz
holds the main masses. Two slices weighing 29.78 g and a polished thin section are on Deposit at
App
.
Data from:
MB109
Table 0
Line 0:
Place of purchase:
Guelmim
Date:
P 2020
Mass (g):
311.8
Pieces:
2
Class:
Howardite
Shock stage:
M-S2
Weathering grade:
low
Fayalite (mol%):
25.2±14.8
Ferrosilite (mol%):
26.0±5.1; 52.7±10.0; 27.5±7.0
Wollastonite (mol%):
1.7±1.1; 3.2±1.2; 40.8±2.2
Magnetic suscept.:
3.63
Classifier:
A. Love, App
Type spec mass (g):
29.78
Type spec location:
App
Main mass:
Fabien Kuntz
Comments:
Submitted by Anthony Love
Institutions
and collections
App
: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Kuntz
: Fabien Kuntz, France;
Website
(private address)
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