Sample Petrographic Description
Sample Number | QUE 93513 |
Newsletter | 18,2 |
Location | Queen Alexandra Range |
Field Number | 8125 |
Dimensions (cm) | 0.5 x 0.4 x 0.2 |
Weight (g) | 0.16 |
Original Classification | E4 Chondrite |
Updated Classification | EH4 Chondrite |
Pairing | QUE 93513; QUE 93523; |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 1-2 | |
Weathering | |
B/C | |
Fracturing | |
B | |
Macroscopic Description - Carol Schwarz | |
Approximately 50% of this tiny rusty and fractured fragment is covered with dark reddish brown fusion crust. Some metal is visible. The entire sample is now embedded in epoxy. | |
Thin Section Description (,1) - Brian Mason | |
The section shows an aggregate of chondrules and chondrule fragments, up to 1.2 mm across, and mineral grains in a moderate amount of black matrix. The chondrules and mineral grains consist almost entirely of pyroxene, with possible traces of olivine. The matrix contains a moderate amount of nickel-iron and sulfides. Weathering is extensive, with veinlets and patches of brown limonite throughout the section. Microprobe analyses show that the pyroxene is close to MgSiO3 in composition (FeO 0.7-1.8%, CaO 0.2-0.6%). The nickel-iron contains 2.1-2.4% Si. One grain of roedderite, NaKMg5Si12O30, was analyzed. The meteorite is classified as an E4 chondrite. | |
Reclassification Notes (AMN 31,1) | |
Reclassified as EH4 Chondrite in AMN 31,1. Reference: A.E.Rubin and E.R.D.Scott, 1997, GCA 61, 425 |
References for Sample QUE93513 | |
Rubin, A. E., Scott, E. R. D., Keil, K., 1997, Shock metamorphism of enstatite chondrites. Geochimica et Cosmochimica Acta, 61 Issue 4, Feb-97, 847-858, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(96)00364-X. | |
Rubin, A. E., Scott, E. R. D., 1997, Abee and related EH chondrite impact-melt breccias. Geochimica et Cosmochimica Acta, 61 Issue 2, Jan-97, 425-435, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(96)00335-3. |