Sample Petrographic Description
Sample Number | LAP 10031 |
Newsletter | 34,2 |
Location | LaPaz Ice Field |
Field Number | 22335 |
Dimensions (cm) | 2.9 x 2.0 x 1.5 |
Weight (g) | 12.34 |
Original Classification | R6 Chondrite |
Pairing | LAP 04840; LAP 10031; LAP 10033; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 39;Ferrosilite (mol%): 32 | |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Cecilia Satterwhite | |
Both of these meteorites have brown/black fusion crust frothy in areas and some oxidation. Areas without fusion crust are a mottled gray color. The mottled gray matrix has numerous dark inclusions. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach, Nicole Lunning | |
These sections are texturally heterogeneous, containing relict chondrules up to 1 mm, isolated mineral grains of 100-200 microns and microcrystalline areas reaching 1 mm with mafic silicate grain sizes of 5-10 microns. Shock effects are pervasive, particularly in plagioclase. The rock consists of FeO-rich olivine (Fa38-39) and orthopyroxene (Fs30-32Wo1). Plagioclase is An8-63Or1-3. Brown, strongly pleochroic hornblende comprises ~15% of the section. Opaques include troilite, pentlandite and chromite. The meteorite is an R chondrite of petrologic type 6. These are likely paired with LAP 04840. |
Antarctic Meteorite Images for Sample LAP 10031 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAP 10031 | ||||
Thin Section Photo(s) : | ||||