Meteoritical Bulletin: Entry for MacAlpine Hills 041269

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MacAlpine Hills 041269

Basic information

Name: MacAlpine Hills 041269
This is an OFFICIAL meteorite name.
Abbreviation: MAC 041269
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 4.5 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 29(1)	(2006)	Howardite
Meteoritical Bulletin:	MB 91	(2007)	Howardite
Recommended:			Howardite [explanation]

This is 1 of 436 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Field number: 15820
Approved 21 Feb 2006

Writeup

Writeup from AMN 29(1):

Sample No.:	MAC 041269
Location:	MacAlpine Hills
Field No.:	15820
Dimensions (cm):	2.0x1.5x1.0
Weight (g):	4.509
Meteorite Type:	Howardite

Macroscopic Description: Kathleen McBride
50% of the exterior surface is covered with black shiny (like glass) fusion crust. The interior is a black and gray, fine grained matrix with black and white inclusions. Very minor amount of rust is present.

Thin Section (,2) Description: Tim McCoy and Linda Welzenbach

Cross-Polarized Light	Plane-Polarized Light

The section shows a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with fine- to coarse-grained basaltic clasts ranging up to 5 mm. Pyroxene ranges from pigeonite composition (possibly finely exsolved) of Fs₅₆Wo₆ to augite of Fs₂₈Wo₄₀. Plagioclase is An₈₉Or_0.5. The meteorite is a howardite.

Data from:
  MB91
  Table 4
  Line 822:

Mass (g):	4.5
Class:	How
Weathering grade:	B
Fayalite (mol%):	56

Catalogs:

Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 29(1) (2006), JSC, Houston
Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

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Photos:

Credit	Photos
Photographs from AMN:
Photograph from unknown source	A photo is in the write-up above
Photos from the Encyclopedia of Meteorites:
unknown

Geography:

Antarctica

Coordinates:
Recommended::	(84° 18' 54"S, 159° 53' 20"E)

Statistics:
This is 1 of 43840 approved meteorites from Antarctica (plus 3802 unapproved names)

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