Dar al Gani 1054 (DaG 1054)        27°25.66’N, 16°09.93’E

Al Jufrah, Libya

Found: 1999

Classification: Ureilite

History: A single 28.4 g stone was found by Romano Serra in a rocky desert area of Libya.

Physical characteristics: Fusion crust absent. Cut surface displays an achondritic texture.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP) Sample fine-grained and homogeneous, with mosaicized texture. Dominated by small (≤30 μm) rounded olivine and rare orthopyroxene. Carbon-rich material, including very small diamonds, occurs at grain boundaries but no distinct aggregates of carbonaceous material are visible. Opaque phases dominated by suessite [(Fe,Ni)₃Si], dispersed in small (≤100 μm) grains or subparallel metal veins, commonly altered to oxides. Presence of rare sulfide grains (mainly troilite).

Geochemistry: Silicates unzoned. Low–Ca pyroxene: Fs_12.2-20.9Wo_0.7-3.0, Cr₂O₃=0.85-0.92 wt%; olivine (Fa_11.0–17.1, CaO=0.29–0.31 wt%, Cr₂O₃=0.80–0.85 wt%). Suessite (at%) has variable composition, with 2 main clusters at Si₂₁Fe₇₈ (Cr=0.68, Ni=0.49) and at Si₂₃Fe₇₄ (Cr=1.34, Ni=1.54) -Fe_0.96Ni_0.04. Troilite contains up to 4.3 wt% Cr.

Classification: Achondrite (ureilite, polymict, anomalous). Anomalous features include absence of zoned olivine, mosaicized texture, presence of suessite with variable composition and fine-grained texture. In spite of the similar abundance of suessite, a pairing with NWA 1241 may be excluded considering the different modal pyroxene/olivine ratio.

Specimens: A total of 8 g specimen and one thin section are on deposit at MSP (MSP 5138). Romano Serra holds the main mass.