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Northwest Africa 12590
Basic information Name: Northwest Africa 12590
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12590
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 1805 g
Classification
  history:
Recommended:  CV3    [explanation]

This is 1 of 493 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 11 Jun 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12590 (NWA 12590)

Morocco

Purchased: 2018 Jun

Classification: Carbonaceous chondrite (CV3)

History: Several fragments of the same material with total weight of 1805 g were purchased by Sergey Vasiliev from Moroccan meteorite dealer at the St. Marie-aux-Mines mineral show in June 2018.

Physical characteristics: Total mass of several pieces is about 1.8 kg. The interior of the meteorite is dark brownish-gray to dark gray whereas surface is dark brown with resinous luster.

Petrography: (Pavel Yu. Plechov, FMMR). Petrographic observation of a polished section shows that meteorite composed of chondrules (to 2 mm, average size about 1 mm) set in abundant matrix (about 50 vol%). Large chondrules often have clear pronounced magmatic rims (100-300 µm in width). PO-IA-type prevails among porphyric chondrules. Olivine has relic cores of Fa0.4-9.9 whereas surrounding olivine and olivine in matrix is Fa40-45. Some olivine in PO chondrules contains small rectangular melilite inclusions. Primary magmatic glass is partially crystallized to submicron aggregate. Fluffy CAIs are common and consists of melilite, spinel and Al-diopside. Huge compact CAI in separate polished plate (about 18 mm) has perfect Wark-Lowering rim. Compact CAI consists of spinel, perovskite, grossmanite, Al-diopside, Ti-kushiroite in melilite matrix. No secondary nepheline, sodalite or phyllosilicates were occurred. Tiny drops (up to 2 µm) of hexamolybdenum and other PGE-rich minerals are occurred. Olivine has no undulatory extinction, as well as the absence of opaque shock veins and melt pockets indicates a shock stage of S1. Olivine, pyroxene and metal are absolutely fresh and not weathered (weathering grade W0).

Geochemistry: Mineral composition and Geochemistry: EDS-WDS analyses (Pavel Yu. Plechov, FMMR). The primary chondrite assemblage includes olivine in chondrules and matrix Fa 27.51±15.61 (N=59), orthopyroxene Fs2.46±1.52Wo3.02±2.03 (N=15) and partially crystallized glass. Composition of kamacite (in wt.%, N=4): Fe 91.7, Ni 5.65, Co 1.85. Taenite (N=10) contain 38.3 and 0.75 wt.% of Ni and Co respectively. Sulfides are troilite. Compact CAI consists of grossmanite (Fs0.4Wo70.87, Al2O3 = 21.22 wt.%, TiO2 = 14.93 wt., N=11), Ti-kushiroite (Fs0.3Wo68.02, Al2O3 = 19.95wt.%, CaO = 24.35 wt., N=7), Al-diopside (Fs0.59Wo53.57, Al2O3-8.33 wt.%, N=1), spinel with varying contents of FeO (3-23 wt.%, N=15) and perovskite (Ca-27.5, Ti-33.6, N=2) in melilite (gehlenite) matrix. Measured H2O is about 2.01±0.07 and C is 0.65 wt.% (by CNH elemental analyzer).

Classification: (Pavel Yu. Plechov, FMMR). Carbonaceous chondrite CV3, reduced sub-group, S1. Reduced subgrop from the composition of sulfides (troilite only), and metal:magnetite ratio.

Specimens: Sergey Vasiliev holds main mass. 39 g, thin section and polished plate with large compact CAI, FMMR.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:St. Marie-aux-Mines
Date:P 2018 Jun
Mass (g):1805
Pieces:several
Class:CV3
Shock stage:S1
Weathering grade:minor
Fayalite (mol%):27.5±15.6 (N=59)
Ferrosilite (mol%):2.5±1.5 (N=15)
Wollastonite (mol%):3.0±2.0 (N=15)
Classifier:Pavel Yu. Plechov, FMMR
Type spec mass (g):39
Type spec location:FMMR
Main mass:Sergey Vasiliev
Comments:Submitted by Pavel Yu. Plechov, pplechov@gmail.com
Institutions
   and collections
FMMR: Fersman Mineralogical Museum, Leninskiy prospekt 18 korpus 2, Moscow, Russia, 119071, Russia; Website (institutional address; updated 24 Feb 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Photos:
CreditPhotos
Public domain photographs:
Pavel Plechov         
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1374 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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