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LaPaz Icefield 03923
Basic information Name: LaPaz Icefield 03923
     This is an OFFICIAL meteorite name.
Abbreviation: LAP 03923
Observed fall: No
Year found: 2003
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 20.6 g
Antarctic Meteorite Newsletter:  AMN 29(1)  (2006)  CK5
Meteoritical Bulletin:  MB 91  (2007)  CK5
MB 101  (2012)  LL5
Antarctic Meteorite Newsletter:  AMN 36(1)  (2013)  LL5
Recommended:  LL5    [explanation]

This is 1 of 3156 approved meteorites classified as LL5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Feb 2006
Revised 25 Feb 2013: Reclassified in AMN 36(1)
Writeup from AMN 29(1):
Sample No.: LAP 03923
Location: LaPaz Ice Field
Field No.: 16455
Dimensions (cm):   3.0x2.5x1.5
Weight (g): 20.6
Meteorite Type: CK5 Chondrite
LAP 03923

Macroscopic Description: Kathleen McBride
The exterior is covered with brown/black fusion crust with polygonal fractures. The gray matrix has minor rust and high metal content. A few gray chondrules are visible.

Thin Section (,2) Description: Tim McCoy
The section consists of large (up to 1.5 mm) poorly-defined chondrules in a matrix of finer-grained silicates, sulfides and magnetite. The meteorite is little weathered, but extensively shock blackened. Silicates are homogeneous. Olivine is Fa31 and orthopyroxene is Fs25. The meteorite is a CK5 chondrite.
Cross-Polarized LightPlane-Polarized LightCross-Polarized LightPlane-Polarized Light
LAP 03923 - Cross-Polarized Light LAP 03923 - Plane-Polarized Light
LAP 03923 - Cross-Polarized Light LAP 03923 - Plane-Polarized Light

Writeup from AMN 36(1):

LaPaz Icefield 03923 (LAP 03923)


Found: 2003

Classification: Ordinary chondrite (LL5)

Reclassification (announced vol. 29, no. 1): This sample was originally classified as a CK5 chondrite, but chemical analyses reveal that it is very close in composition (Zn/Mn vs. Al/Mn) to many other LL chondrites (Isa, M. et al., 2011, LPSC abstract #1876). This information, together with the observation that there is metal present and no magnetite, has led us to reclassify this sample as an LL5 chondrite.

Data from:
  Table 4
  Line 396:
Mass (g):20.6
Weathering grade:A/B
Fayalite (mol%):31
Ferrosilite (mol%):25
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 29(1) (2006), JSC, Houston
Published in Antarctic Meteorite Newsletter 36(1) (2013), JSC, Houston
Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photographs from AMN:
Photograph from unknown source A photo is in the write-up above


     This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names)

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