Meteoritical Bulletin: Entry for Northwest Africa 4255

header

MetSoc Home Publications Contacts

Search the Meteoritical Bulletin Database
Last update: 5 Sep 2024
Search for:	Search type:	Search limits:	Display:	Publication:
Names Text Places Classes Years	Contains Starts with Exact Sounds like	NonAntarctic Falls Non-NWAs Has strewnfield		What's new in the last:
Include past classifications in search		Has photo	Limit to approved meteorite names
Search text:

Northwest Africa 4255

Basic information

Name: Northwest Africa 4255
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4255
Observed fall: No
Year found: 2002
Country: Algeria
Mass: 6 kg

Classification
history:

Meteoritical Bulletin:	MB 92	(2007)	Diogenite
Recommended:			Diogenite [explanation]

This is 1 of 545 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 24 Jul 2007

Writeup

help

Writeup from MB 92:

Northwest Africa 4255 27°51'00"N, 7°48'00"W

Hamada du Draa, southwest of Algeria

Find: September 2002

Achondrite (diogenite)

History: Nomads found the meteorite in September 2002 in Hamada du Draa, Southwest Algeria.

Physical characteristics:The total mass is 6000 g and is fragmented into 100s of pieces, some of which are partly covered with fusion crust.

Petrography: (A. Seddiki, Ud'OEA and UJM; B. Moine, J.Y. Cottin, UJM; M. Denise, V. Sautter, J.P. Lorand, MNHNP). Predominantly composed orthopyroxene with scarce inclusions of troilite, ilmenite, spinel, olivine and metallic Fe-Ni.

Mineral compositions and geochemistry: Orthopyroxene (Fs_25.3Wo_1.5; Fe/Mn = 23-28 [atomic]), spinel (Cr = 0.92 wt%), olivine (Fa₃₀), Fe, Ni-rich metal (NiO = <1 wt%). Oxygen isotopes: δ¹⁸O = 3.25, δ¹⁷O = 1.31, Δ¹⁷O = -0.38 (all ‰).

Classification: Achondrite (diogenite); S2, minor weathering.

Type specimens: A total of 21 g of sample is on deposit at MNHNP. Two thin sections are on deposit at UJM. An anonymous finder holds the main mass.

Data from:
  MB92
  Table 2
  Line 18:

Place of purchase:	Hamada du Draa
Date:	Sep-2002
Mass (g):	6000
Pieces:	Many 100s
Class:	Dio
Type spec mass (g):	21

Plots:

O isotopes:

Institutions
and collections

MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
UJM: Université Jean Monnet, Saint-Etienne, France (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)

Find references in NASA ADS:
Find references in Google Scholar:

Geography:

Algeria

Algeria

Coordinates:
Recommended::	(27° 51'N, 7° 48'W)

Statistics:
This is 1 of 61 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
This is 1 of 1399 approved meteorites from Algeria (plus 33 unapproved names) (plus 4 impact craters)

Proximity search:

Direct link to this page