Eucrite 7.5g | NWA 7334
NWA 7334 | 8g Eucrite
This has a very low TKW and low weathering (W1)
The Eucrite is one of the three meteorites from the asteroid 4 Vesta. Together the Howardite (H), Eucrite (E), and Diogenite (D), make up the HED suite of achondrite meteorites originating from Vesta. There are several competing contemporary theories that aspire to describe the crustal makeup of Vesta, but it is generally agreed that the Vestan crust is made of diogenetic material and eucritic material. Howardites are a breccia of the eucritic and diogenetic materials.
Northwest Africa 7334 (NWA 7334)
Classification: HED achondrite (Eucrite)
Physical characteristics: Stone with black shiny fusion crust, saw cut reveals fresh, fine-grained texture, light gray groundmass, some fine melt veins.
Petrography: (C. Agee, UNM): Microprobe examination of a polished mount shows a 65% pyroxene-30% plagioclase intersertal texture, some pyroxenes with exsolution lamellae. Accessory silica, troilite, and ilmenite; minor zircon.
Geochemistry: (C. Agee and M. Spilde, UNM, by EMPA): Pyroxene Fs49.2±14.2Wo17.9±16.8, Fe/Mn=32±1, n=31 with equilibrated trend Fs63.9Wo1.7 to Fs27.4Wo43.6; plagioclase Or0.6±0.1Ab10.6.1±0.8An88.9±0.8, n=3.
Classification: Achondrite (Eucrite). Equilibrated main group eucrite. Minimal weathering.
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