Sample Petrographic Description
| Sample Number | QUE 99680 |
| Newsletter | 25,2 |
| Location | Queen Alexandra Range |
| Field Number | 12579 |
| Dimensions (cm) | 3.5 x 2.5 x 1.5 |
| Weight (g) | 15.68 |
| Original Classification | CK5 Chondrite |
| Pairing | QUE 99680; QUE 99681; |
| Mineral Composition (%Fa & %Fs) | |
| Fayalite (mol%): 29;Ferrosilite (mol%): 21 | |
| Weathering | |
| Ce | |
| Fracturing | |
| C | |
| Macroscopic Description - Kathleen McBride | |
| The exterior of 680 is covered with 50% brown/black fusion crust with polygonal fractures. The interior is a vuggy, weathered charcoal gray matrix with evaporites. The rock contains white and gray inclusions, ranging in size from 1-3 mm. 681 has 20% black fusion crust with polygonal fractures and evaporites. The interior is similar to 680 but has more evaporites and, an evaporite material that gives the rock the appearance of being smeared with toothpaste. White and gray inclusions are visible ranging in size from <1 - 2 mm. | |
| Thin Section Description (,2) - Gretchen Benedix, Linda Welzenbach, Tim McCoy | |
| These two meteorites are so similar that a single description suffices. The sections consist of large (up to 2 mm), well-defined chondrules in a matrix of finer-grained silicates, sulfides and very abundant magnetite. The meteorites are little weathered, but extensively shock blackened. Silicates are homogeneous. Olivine is Fa29 and orthopyroxene is Fs21-23. The meteorites are CK5 chondrites. | |
| Antarctic Meteorite Images for Sample QUE 99680 | ||||
| Field Photo(s) : | ||||
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| Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah | ||||
| Antarctic Meteorite Images for Sample QUE 99680 | ||||
| Lab Photo(s) : | ||||
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| Antarctic Meteorite Images for Sample QUE 99680 | ||||
| Thin Section Photo(s) : | ||||
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| References for Sample QUE99680 | |
| Righter, K., Neff, K. E., 2007, Temperature and oxygen fugacity constraints on CK and R chondrites and implications for water and oxidation in the early solar system. Polar Science, 1 Issue 1, Aug-07, 25-44, ISSN 1873-9652, http://dx.doi.org/10.1016/j.polar.2007.04.002. | |
| Rubin, A. E., Huber, H., 2005, A weathering index for CK and R chondrites. Meteoritics & Planetary Science, 40, 1123-1130, http://dx.doi.org/10.1111/j.1945-5100.2005.tb00178.x. | |