Northwest Africa 1181

Morocco

Found 2001

Achondrite (polymict eucrite)

A 3279 g, crusted stone was purchased in Rissani, in 2001. Classification and mineralogy (T. Bunch and J. Wittke, NAU): modal analyses (area of 34 cm₂), eucritic basalts, 94 vol%; shock melt clasts, 4 vol%, diogenites, 2 vol%. At least 34 different eucrite clasts were observed that range from micro-ophitic/subophitic (<0.1 mm) to cumulate to very coarse-grained gabbroic (3–7 mm). Gabbro pyroxenes are predominantly 2–5 mm in size, subcalcic ferroaugites (TiO₂, 0.9 to 2.1 wt%) with 3–6 mm plagioclase, An₉₂; ilmenite, chromite (Al₂O₃ = 9.2 wt%), and acicular crystals of tridymite up to 7 mm in length. Shock stage, S2; weathering grade, variable, W1 to W2. Specimens: type specimen, 18.4 g and three thin sections, NAU; main mass is with the purchaser.