Sample Petrographic Description
Sample Number | LAP 03923 |
Newsletter | 29,1 |
Location | LaPaz Ice Field |
Field Number | 16455 |
Dimensions (cm) | 3.0 x 2.5 x 1.5 |
Weight (g) | 20.60 |
Original Classification | CK5 Chondrite |
Updated Classification | LL5 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 31;Ferrosilite (mol%): 25 | |
Weathering | |
A/B | |
Fracturing | |
A | |
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 Description (,2) - 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. | |
Reclassification Notes (AMN 36,1) | |
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. |
Antarctic Meteorite Images for Sample LAP 03923 | ||||
Lab Photo(s) : | ||||