| Pairing |
|
| Newsletter |
32,1 |
| Location |
Miller Range |
| Field Number |
18795 |
| Dimensions |
2.0 x 2.0 x 1.0 |
| Weight |
4.560 |
| Original Classification |
Diogenite |
| Macroscopic Description - Kathleen McBride |
| The exterior has 40% brown/black fusion crust. The interior matrix is fine grained, tan in color and has black inclusions. |
| Thin Section
(,3) Description - Tim McCoy and Linda Welzenbach |
| The section consists of an unbrecciated mass 2-5 mm orthopyroxene grains which interfinger at grain boundaries. Blebby diopside lamellae are common within the orthopyroxene. Large (several hundred microns) chromites are common at grain boundaries. Orthopyroxene has a composition of Fs36Wo2, diopside is Fs14Wo45 and plagioclase is An92. The Fe/Mn ratio of the pyroxene is ~30. The meteorite is likely a diogenite, although the texture is unlike typical diogenites and the pyroxene composition more FeO-rich than typical of diogenites. |
| Oxygen Isotopic Analysis - D. Rumble, Carnegie Institution of Washington |
δ17O = 1.62, δ18O =3.57, Δ17O = -0.260
δ17O = 1.55, δ18O = 3.55, Δ17O = -0.316
[Where Δ17O = δ17O - 0.52 x δ18O] |
