NWA 869陨石，L3-6。 最著名的球粒陨石。 - 36.54 g

Northwest Africa 869
Find: 2000 or 2001
Physical characteristics: 大多数样本为单独陨石，但也有一些碎片（大多数>1 千克）存在。在大多数情况下，熔壳已被抛光或被风蚀去角。许多样本受损更严重，表面呈现深层风蚀特征。由地面碰撞形成的断裂面呈现典型的灰绿颜色，有时可见角砾化（明/暗碎块）。由于该角砾岩的颗粒粗糙，有些石块仅由单一岩相组成。
Petrography: This chondritic breccia consists of about 75 vol% matrix with unequilibrated and equilibrated L-chondrite clasts (up to 5.5 cm), some of which display shock-darkening. Impact melt-rock clasts, themselves either clast-free or clast-poor, also occur and are strongly depleted in Fe,Ni metal and sulfide.
岩石学：这种球粒陨石性角砾岩约含75体积%基质，夹有未平衡和已平衡的L型陨石碎块（最大直径5.5 cm），其中一些显示冲击致暗。冲击熔岩质岩碎块本身可能无碎块或碎块稀少，也存在，且在Fe、Ni金属和硫化物方面显著耗竭。
Geochemistry: Northwest Africa 869 is a regolith breccia, containing solar noble gases and preirradiated lithologies. Olivine in lithic clasts: Fa0.2-49.2; olivine in matrix: Fa10.3-29.3; low-Ca pyroxene in lithic clasts: Fs2.1-35.9; low-Ca pyroxene in matrix: Fs7.0-23.9. Bulk oxygen isotopes: δ17O = 3.52; δ18O = 4.67; Δ17O = 1.09 per mil. Terrestrial age: 4.4 ± 0.7 ka. Preatmospheric meteoroid size and mass: 225 ± 25 cm, 120-230 T.
地球化学：NWA 869 是一块风化覆砾胎岩，含有太阳态稀有气体和预辐照岩性。岩块中的橄榄石成分：Fa0.2-49.2；基质中的橄榄石：Fa10.3-29.3；岩块中的低-Ca辉石：Fs2.1-35.9；基质中的低-Ca辉石：Fs7.0-23.9。总体氧同位素：δ17O = 3.52 ‰；δ18O = 4.67 ‰；Δ17O = 1.09 ‰。地球年龄：4.4 ± 0.7 千年。大气层外陨石体积/质量：225 ± 25 cm，120-230 吨。
Classification: Because NWA 869 contains unequilibrated clasts, its classification is revised to L3-6.
分类：由于 NWA 869 含有未平衡的碎块，其分类修订为 L3-6。
This lot comes with certificate of authenticity.
本批附有真实性证书。
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