独特的CR2陨石切片，NWA 8725配对 碳質球粒隕石 - 3.93 g - (1)

Northwest Africa 8725 (NWA 8725)

(Northwest Africa)

Classification: Carbonaceous chondrite (CR2)

Physical characteristics: 单一石块。表面光亮黑色，风化不规则，可见部分 CAIs。锯切后可揭示许多独立球粒（850±500 μm，n=17）以及散布在棕色基质中的小 CAIs。

Petrography: (C. Agee, UNM) 通过抛光标本的显微探针分析显示，存在大量多晶球粒，许多被 Fe-Ni 金属薄片或颗粒包裹或包含其中，约占本陨石的 ~10%；AOA 存在，约 40% 为细粒基质，检测到片状硅酸盐、FeNi 硫化物和方铁硫化物。

Geochemistry: (C. Agee and N. Muttik, UNM) Ferroan chondrule olivine Fa9.4±15.4, n=27, Fe/Mn=51±29, Cr2O3=0.19±0.09, n=23; Forsteritic chondrule olivine Fa0.9±0.5, Cr2O3=0.28±0.19, n=4; enstatite Fs2.0±0.7Wo2.0±3.2, n=16; aluminous diopside Fs1.6±0.5Wo35.5±6.9, n=8.

Classification: Carbonaceous chondrite (CR2). Moderately weathered, low shock stage.
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