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Northwest Africa 13518
Basic information Name: Northwest Africa 13518
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13518
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 2.63 kg
Classification
  history:
Recommended:  R4-5    [explanation]

This is 1 of 5 approved meteorites classified as R4-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 12 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13518 (NWA 13518)

(Northwest Africa)

Purchased: 2020 Mar

Classification: Rumuruti chondrite (R4-5)

History: Purportedly found in 2019 at the border between Algeria and Mali. Purchased by Mohamed Ali (972 g) and Miguel Angel Contreras (1662 g) from a Saharaui dealer in Mauritania in March 2020.

Physical characteristics: Many pieces between a few grams and >500 g, some with fusion crust.

Petrography: (K. Metzler, IfP) Chondritic genomict breccia, consisting of dark host material and light chondritic clasts up to ~2 cm. The host material is of petrologic type 4. It consists of chondrules and chondrule fragments, embedded in recrystallized interchondrule material. Relictic Mg-rich olivine cores can be occasionally observed. The light clasts are strongly metamorphosed and represent type 5 material with clearly recognizable chondrules.

Geochemistry: Mineral compositions and geochemistry: Dark host material : Mean olivine composition: Fa38.7±0.2 (Fa38.4-39.0); n=10; mean low-Ca pyroxene composition Fs19.8±6.7Wo1.0±1.0 (Fs7.6-29.9Wo0.2-2.9); n=8. Light clast of petrologic type 5: mean olivine composition Fa38.8±0.3 (Fa38.1-39.2); n=8; mean low-Ca pyroxene composition: Fs29.9±0.4Wo1.3±0.5 (Fs29.1-30.6Wo0.6-2.2); n=10. Accessories in both lithologies are troilite and pentlandite; no metal was found.

Classification: R chondrite based on mineral chemistry. Genomict breccia, consisting of clasts of petrologic type 5 (equilibrated olivine and pyroxene), embedded in host material of petrologic type 4 (equilibrated olivine and unequilibrated pyroxene).

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2020 Mar
Mass (g):2634
Pieces:67
Class:R4-5
Shock stage:C-S3
Weathering grade:Low
Fayalite (mol%):38.7±0.2; 38.8±0.3
Ferrosilite (mol%):19.8±6.7; 29.9±0.4
Wollastonite (mol%):1.0±1.0; 1.3±0.5
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Miguel Angel Contreras
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections		 IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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