Sample Petrographic Description
| Sample Number | GRO 95534 |
| Newsletter | 19,2 |
| Location | Grosvenor Mountains |
| Field Number | 7618 |
| Dimensions (cm) | 3.0 x 2.7 x 1.5 |
| Weight (g) | 17.92 |
| Original Classification | Howardite |
| Pairing | GRO 95534; GRO 95535; GRO 95574; GRO 95581; GRO 95602 |
| Mineral Composition (%Fa & %Fs) | |
| Ferrosilite (mol%): 20-53 | |
| Weathering | |
| A/B | |
| Fracturing | |
| A | |
| Macroscopic Description - Cecilia Satterwhite | |
| The exterior surfaces of these achondrite meteorites have smooth, shiny black fusion crust over seventy five percent of their surface. Areas where fusion crust has been plucked away reveal a gray matrix . The interior reveals a gray fine-grained texture with abundant white inclusions. A few green and black minerals are present. Minor oxidation is present. | |
| Thin Section Description (,3) - Brian Mason | |
| The sections are so similar that a single description will suffice; the meteorites are probably paired. They show a groundmass of comminuted pyroxene (orthopyroxene and pigeonite) and plagioclase (grains up to 0.2 mm), with a few larger mineral clasts and rare polymineralic clasts up to 2.5 mm across. Microprobe analyses show a wide range in pyroxene composition: Wo1-40, Fs20-60, En33-79, but with orthopyroxene clustered around Wo8Fs53 to Wo40Fs27 with fairly uniform En content. Plagioclase composition is An86-93. An SiO2 polymorph, probably tridymite, is present in accessory amounts. The meteorites are howardites. | |
| Antarctic Meteorite Images for Sample GRO 95534 | ||||
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| Antarctic Meteorite Images for Sample GRO 95534 | ||||
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| References for Sample GRO95534 | |
| Hahn, T.M., Lunning, N.G., McSween, H.Y., Bodnar, R.J., and Taylor, L.A., 2017, Mg-rich harzburgites from Vesta: Mantle residua or cumulates from planetary differentiation. , Meteoritics & Planetary Science, 53 , 514-546 , doi: 10.111/maps.13036. | |
| Lunning, N. G., Welten, K. C., McSween, H. Y., Caffee, M. W., Beck, A. W., 2016, Grosvenor Mountains 95 howardite pairing group: Insights into the surface regolith of asteroid 4 Vesta. , Meteoritics & Planetary Science, 51(1) , 167-194 . | |
| Lunning, N. G., Mcsween Jr., H. Y., Tenner, T. J., Kita, N. T., Bodnar, R. J., 2015, Olivine and pyroxene from the mantle of asteroid 4 Vesta. , Earth and Planetary Science Letters, 418 , 15-May-15 , 126-135 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2015.02.043 . | |