Sample Petrographic Description
Sample Number | GRA 98037 |
Newsletter | 23,1 |
Location | Graves Nunataks |
Field Number | 11342 |
Dimensions (cm) | 6.0 x 4.5 x 4.0 |
Weight (g) | 107.86 |
Original Classification | Eucrite (Brecciated) |
Pairing | GRA 98019; GRA 98037; GRA 98039; GRA 98042; GRA 98043; GRA 98052; GRA 98055; GRA 98097; GRA 98113; GRA 98114; GRA 98157; GRA 98158; GRA 98159; |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 62 | |
Weathering | |
A | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
These fine-grained achondrites vary in color from gray to tan to greenish and also contain various colored clasts. All possess varying amounts of fusion crust that is brown-black in color and usually contains small shiny patches. Most of them are “vuggy” and show varying degrees of weathering. Thin, black glassy veins are visible in the matrix. Some (usually the greenish ones) have areas of rusty-red minerals that have stained the adjacent minerals red. | |
Thin Section Description - Tim McCoy | |
These meteorites are dominated by fine-grained (~200 micron average grain size) basaltic material which occurs as both the host and clasts within these meteorites. Occasional coarser-grained clasts, with grain sizes up to 0.5 mm, are observed in some members of the group, including GRA 98042, GRA 98052 and GRA 98055. Mineral compositions are similar and homogeneous with orthopyroxene (Fs64Wo2), with lamellae of augite (Fs28Wo44), and plagioclase (An89Or0.5). The Fe/Mn ratio of the pyroxene is ~28. The meteorites are brecciated eucrites. |
Antarctic Meteorite Images for Sample GRA 98037 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRA 98037 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRA98037 | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |