Sample Petrographic Description
Sample Number | EET 90428 |
Newsletter | 15,2 |
Location | Elephant Moraine |
Field Number | 7287 |
Dimensions (cm) | 2.0 x 1.7 x 0.7 |
Weight (g) | 7.25 |
Original Classification | Carbonaceous C4 |
Updated Classification | CK5 Chondrite |
Pairing | EET 87507; EET 16006; EET 16029; EET 16048; EET 16049; EET 16170; EET 16172; EET 16201; EET 16203; EET 87508; EET 87514; EET 87519; EET 87525; EET 87526; EET 87527; EET 87529; EET 90001; EET 90002; EET 90003; EET 90004; EET 90005; EET 90006; EET 90007; EET 90008; EET 90009; EET 90010; EET 90013; EET 90014; EET 90015; EET 90016; EET 90017; EET 90018; EET 90022; EET 90023; EET 90025; EET 90026; EET 90027; EET 90028; EET 90035; EET 90036; EET 90038; EET 90039; EET 90040; EET 90041; EET 90042; EET 90044; EET 90045; EET 90046; EET 90048; EET 90049; EET 90050; EET 90052; EET 90234; EET 90428; EET 90991; EET 92002; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 30 | |
Weathering | |
A/Be | |
Fracturing | |
A | |
Macroscopic Description - Robbie Marlow | |
Fractured, dull, black fusion crust covers up to 50% of each of these carbonaceous chondrite fragments. Areas devoid of fusion crust are greenish gray in color. EET90234 and 90248 are more weathered than 90247. 90234 and 90248 have a dark gray interior and contain evaporite deposit. 90247 is light gray, has a thin weathering rind and several millimeter-sized dark gray inclusions. | |
Thin Section Description (,5) - Brian Mason | |
A few well-defined chondrules, up to 1.2 mm across, are present, but most of the section consists of anhedral olivine grains, 0.05-0.1 mm across, with minor plagioclase and opaques. The opaques consist largely of magnetite and pentlandite; nickel-iron is absent. Microprobe analyses show olivine of uniform composition, Fa28; one grain of diopside, Wo46 Fs7, and one grain of plagioclase, An49, were analyzed. The meteorite is classified as a C4 chondrite, and probably belongs to the EET87507 pairing group. EET90247,3 and EET90428,2 are similar in all respects. | |
Reclassification Notes (AMN 17,1) | |
Re-classified to CK5 according to Kallemeyn, G. W., Rubin, A. E., Wasson, J. T., 1991, The compositional classification of chondrites: V. The Karoonda (CK) group of carbonaceous chondrites. Geochimica et Cosmochimica Acta, 55, 881-892. |
Antarctic Meteorite Images for Sample EET 90428 | ||||
Thin Section Photo(s) : | ||||