NWA 13435 - Achondrite Diogenite - Predominantly Green Blocky Orthopyroxene

Description

NWA 13435
NWA 13435
Found Sahara, 2020
Differenciated Achondrite, Vestan (HED)
Diogenite
Specimen is 1.06g, as found
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Northwest Africa 13435
Basic information
Name:
Northwest Africa 13435
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 13435
Observed fall:
No
Year found:
2020
Country:
(Northwest Africa)
Mass:
277 g
Classification
history:
Recommended:
Diogenite
Comments:
Approved 2 Nov 2020
Writeup
Writeup from MB 109:
Northwest Africa 13435
(NWA 13435)
(Northwest Africa)
Purchased: 2020 Feb
Classification: HED achondrite (Diogenite)
History
: The meteorite was purchased from a local meteorite dealer in Zagora, Morocco.
Physical characteristics
: Many light brownish fragments ranging from less than one gram to 115 g lacking any fusion crust.
Petrography
: The meteorite is a monomict breccia predominantly composed of blocky up to 3.5 mm sized orthoproxene grains and rare more fine-grained cataclastic regions. Minor phases include plagioclase, chromite, FeS, and symplectic chromite-silica-intergrowths. No metallic iron has been found.
Geochemistry
: low-Ca pyroxene: Fs
27.6±0.1
Wo
3.2±0.4
(Fs
27.2-27.8
Wo
2.9-4.0
, n=16, FeO/MnO=25-28); calcic plagioclase: An
91.8±1.6
(An
88.9-93.4
, n=12)
Data from:
MB109
Table 0
Line 0:
Place of purchase:
Zagora, Morocco
Date:
P 2020 Feb
Mass (g):
277.3
Pieces:
many
Class:
Diogenite
Shock stage:
low
Weathering grade:
low
Ferrosilite (mol%):
27.6
Wollastonite (mol%):
3.2
Classifier:
A. Greshake, MNB
Type spec mass (g):
21.3
Type spec location:
MNB
Main mass:
Kuntz
Comments:
Submitted by Ansgar Greshake
Institutions
and collections
MNB
: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Kuntz
: Fabien Kuntz, France;
Website
(private address)
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