NWA 10800 is a spectacular monomict eucrite, and is another contribution to science on behalf of the Natural History Lab. Most eucrites available are small fragments or slices from stones no greater in size than a golf ball, or baseball on rare occasion. However, we took a huge 3.59kg eucrite stone, had it sliced, and then polished it to perfection. Whether you're a collector or institution, this eucrite slice offers a lot of WOW!
Slice size is approx. 140mm (5 1/2") x 118mm (4 1/4") x 3mm
Petrography: (A. Irving and S. Kuehner, UWS) Rounded clasts of shocked basaltic eucrite occur in a sparse dark brown, fine grained matrix. Minerals are exsolved pigeonite (some with orange-brown cores), calcic plagioclase (polycrystalline), silica polymorph, ilmenite and Ti-chromite, with rare zircon (grains up to 5 μm), troilite and minor secondary barite.
Geochemistry: Low-Ca pyroxene host (Fs58.9-60.5Wo5.0-2.7, FeO/MnO = 29-32, N = 3), clinopyroxene exsolution lamellae (Fs26.5-28.6Wo43.5-41.7, FeO/MnO = 29-30, N = 2).