Sample Petrographic Description
Sample Number | LAP 031346 |
Newsletter | 29,2 |
Location | LaPaz Ice Field |
Field Number | 16971 |
Dimensions (cm) | 2.0 x 1.25 x 1.25 |
Weight (g) | 5.40 |
Original Classification | L3 Chondrite |
Updated Classification | L3.3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 5-40;Ferrosilite (mol%): 4-16 | |
Weathering | |
B/C | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exterior has thick dull black fusion crust. The matrix is a rusty black with moderate amounts of metal. Light and rusty chondrules are visible. | |
Thin Section Description (,2) - Valerie Reynolds, Tim McCoy | |
The section exhibits numerous well-defined chondrules (up to 2.5 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 Fa5-40 and pyroxenes from Fs4-16. 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. |