Sample Petrographic Description
Sample Number | LAR 06507 |
Newsletter | 33,1 |
Location | Larkman Nunatak |
Field Number | 19639 |
Dimensions (cm) | 2.5 x 1.5 x 1.5 |
Weight (g) | 12.05 |
Original Classification | LL Chondrite (Impt Melt) |
Updated Classification | CK6 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 34 | |
Weathering | |
Be | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exterior has a thick patch of fusion crust covering <5% of the surface. The interior is gray in color with an oxidation rind, evaporites and is low in metal. Millimeter sized gray chondrules are present. | |
Thin Section Description (,2) - Cari Corrigan | |
This section consists of a matrix of individual mineral fragments up to 100 microns in a melt-textured matrix with rounded to ellipsoidal metal-sulfide blebs. It also exhibits larger (up to several mm) unmelted chondritic fragments with rare relict barred olivine chondrules. Olivine is Fa4, pyroxene is Fs1. This meteorite is an LL chondrite impact melt breccia. | |
Reclassification Notes (AMN 39,1) | |
LAR 06507 was classified as an LL impact melt breccia in the Antarctic Meteorite Newsletter vol. 33 No. 1 (February 2010). More detailed information has led to a better understanding of this sample, which we here re-classify to shocked CK6 chondrite, based on the abundance of magnetite, the near absence of metal, equilibrated olivine fayalite content of 31±3, and Ni-rich olivine.
References:
|
Antarctic Meteorite Images for Sample LAR 06507 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 06507 | ||||
Thin Section Photo(s) : | ||||