Sample Petrographic Description
Sample Number | LAP 03834 |
Newsletter | 29,1 |
Location | LaPaz Ice Field |
Field Number | 16780 |
Dimensions (cm) | 1.8 x 1.5 x 1.5 |
Weight (g) | 5.84 |
Original Classification | CK3 Chondrite |
Updated Classification | R3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 4-42;Ferrosilite (mol%): 11-20 | |
Weathering | |
B/C | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
80% of the exterior of this meteorite has black fractured fusion crust. The interior is a fine grained gray matrix with some oxidation. Light gray and white mm sized inclusions are visible. | |
Thin Section Description (,2) - Tim McCoy | |
The section consists of well-defined (up to 1 mm) chondrules in a matrix of finer-grained silicates, sulfides and very abundant magnetite. The meteorite is little weathered, but extensively shock blackened. Olivine is Fa4-42, with most grains Fa30-40, and orthopyroxene is Fs11-20. The meteorite is a CK3 chondrite. | |
Reclassification Notes (AMN 36,1) | |
This sample was originally classified as a CK3 chondrite, but chemical analyses reveal that it (as well as MET 01149 which we reclassified a few years ago) is very close in composition (Zn/Mn vs. Al/Mn) to many other R chondrites (Isa, M. et al., 2011, LPSC abstract #1876). This information, together with the observation that there is abundant sulfide, but little to no magnetite has led us to reclassify this sample as an R3 chondrite. |
Antarctic Meteorite Images for Sample LAP 03834 | ||||
Lab Photo(s) : | ||||