Meteoritical Bulletin: Entry for MacAlpine Hills 041169

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MacAlpine Hills 041169

Basic information

Name: MacAlpine Hills 041169
This is an OFFICIAL meteorite name.
Abbreviation: MAC 041169
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 2 g

Classification
history:

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

This is 1 of 144 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Field number: 15371
Approved 21 Feb 2006
Revised 28 Oct 2019: Corrected mass, per JSC

Writeup

Writeup from AMN 29(1):

Sample No.:	MAC 041169
Location:	MacAlpine Hills
Field No.:	15371
Dimensions (cm):	1.75x1.5x0.75
Weight (g):	3.187
Meteorite Type:	Eucrite (Unbrecciated)

Macroscopic Description: Kathleen McBride
40% rough, black fusion crust covers the exterior of this meteorite. The interior is a coarse grained black and white matrix with rusty areas.

Thin Section (, 3) Description: Tim McCoy

Cross-Polarized Light	Plane-Polarized Light

The meteorite is a medium-grained (100-200 micron grain size), unbrecciated basalt with numerous late-stage interstitial melt pockets that can reach several hundreds of microns. Mineral compositions are relatively homogeneous with orthopyroxene (Fs_57-64Wo_2-5), with 1-5 micron lamellae of augite (Fs₃₂Wo₃₉), and plagioclase (An₈₉Or_0.5). The Fe/Mn ratio of the pyroxene is ~30. The meteorite is an unbrecciated eucrite.

Data from:
  MB91
  Table 4
  Line 821:

Mass (g):	3.2
Class:	Euc (unbrecciated)
Weathering grade:	B
Fayalite (mol%):	57-64

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' 53"S, 159° 50' 2"E)

Statistics:
This is 1 of 45260 approved meteorites from Antarctica (plus 3472 unapproved names)

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