Sample Petrographic Description
Sample Number | LAP 031220 |
Newsletter | 29,2 |
Location | LaPaz Ice Field |
Field Number | 16044 |
Dimensions (cm) | 2.25 x 1.25 x 0.75 |
Weight (g) | 3.10 |
Original Classification | EH4 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 0-2 | |
Weathering | |
C | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
60% of the exterior has brown/black fusion crust. The interior black matrix is very rusty with minor metal and a rough texture. | |
Thin Section Description (,2) - Tim McCoy | |
The section shows an aggregate of chondrules (up to 1 mm), chondrule fragments, and pyroxene grains in a matrix of about 30% metal and sulfide. It has about 1.4 wt.% Si in the metal. Pyroxene is Fs0-2. The meteorite is an EH4 chondrite. |
References for Sample LAP031220 | |
Weyrauch, M., Horstmann, M., and Bischoff, A., 2018, Chemical variations of sulfides and metal in enstatite chondrites—Introduction of a new classification scheme. Meteorit Planet Sci, , 53, 394-415, doi:10.1111/maps.13025. |