Sample Petrographic Description
Sample Number | CRA 03540 |
Newsletter | 29,2 |
Location | Mt. Cranfield |
Field Number | 14911 |
Dimensions (cm) | 6.3 x 5.0 x 2.5 |
Weight (g) | 151.92 |
Original Classification | L3 Chondrite |
Updated Classification | L3.3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0-26;Ferrosilite (mol%): 7-17 | |
Weathering | |
Be | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
The exterior has a black fusion crust over 60% of its surface. The fusion crust is frothy in areas and fractures are visible. Evaporite deposits and rust are present. Areas without fusion crust are rusty brown with some rust stained inclusions. The interior is a dark gray matrix with abundant inclusions. Inclusions are lighter in color than the surrounding matrix and some are weathered. | |
Thin Section Description (,2) - Valerie Reynolds, Tim McCoy | |
The section exhibits numerous well-defined chondrules (up to 2 mm) in a black matrix of fine-grained silicates, metal and troilite. Polysynthetically twinned pyroxene is abundant and a few chondrules contain glass. The meteorite is moderately weathered. Silicates are unequilibrated; olivines range from Fa0-26 and pyroxenes from Fs7-17. The meteorite is an L3 chondrite and may be of low subtype (estimated subtype 3.3). | |
Reclassification Notes (AMN 29,2) | |
Classification updated to L3.3, as announced in AMN vol. 29, no. 2. |
References for Sample CRA03540 | |
Bonal, L., Quirico, E., Flandinet, L., Montagnac, G., 2016, Thermal history of type 3 chondrites from the Antarctic meteorite collection determined by Raman spectroscopy of their polyaromatic carbonaceous matter. Geochimica et Cosmochimica Acta, 189, 312-337. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |