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Northwest Africa 7622
Basic information Name: Northwest Africa 7622
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7622
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 61 g
Meteoritical Bulletin:  MB 102  (2013)  H3
Recommended:  H3    [explanation]

This is 1 of 663 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 26 May 2013
Writeup from MB 102:

Northwest Africa 7622 (NWA 7622)

(Northwest Africa)

Purchased: 2011

Classification: Ordinary chondrite (H3)

History: Purchased by Nicola Castellano at the Torino Mineral Show, Italy.

Physical characteristics: A single piece weighing 61 g with fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP) The meteorite consists of 250-550 μm chondrules of different types (PO, POP, BO, RP) and their fragments embedded in a fine-grained matrix; matrix silicates are mainly olivine and orthopyroxene, with minor clinopyroxene; some olivine grains in BO and PO chondrules are markedly zoned and contain a glassy mesostasis. Opaque phases are kamacite and troilite.

Geochemistry: Olivine, Fa15.2-21.2, mean Fa17.9, PMD = 22; Orthopyroxene, Fs14.8-16.9En83.9-81.8Wo1.3, mean Fs15.8En82.9Wo1.3.

Classification: PMD of 22% is consistent with type 3.8.

Specimens: Type specimen, 12.90 g, MSP; main mass Castellano.

Data from:
  Table 0
  Line 0:
Place of purchase:Torino
Date:P 2011
Mass (g):61
Shock stage:S1
Weathering grade:W4
Fayalite (mol%):15.2-21.1
Ferrosilite (mol%):14.8-16.9
Wollastonite (mol%):1.29
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, MSP
Type spec mass (g):12.90
Type spec location:MSP
Main mass:Castellano
Comments:Inv. # MSP 5220; submitted by Vanni Moggi Cecchi
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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