NWA 869 陨石，L3-6. 最著名的球粒陨石。 - 53.61 g

西北非 869
Find: 2000 or 2001
Physical characteristics: 大多数样品为单独陨石，但也有一些碎块（大多>1 kg）存在。在大多数情况下，熔融地壳已被抛光或因风蚀而削蚀。许多样品受影响更严重，表面带有深度风蚀特征。由碰撞地表产生的断面呈典型的灰绿色，有时可见角砾化（浅色和/或深色碎屑）。由于此碎裂岩的粗糙度，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.
岩相学：这块含球粒的碎裂岩约75体积百分比为基质，夹有未平衡和已平衡的L型陨石碎片（最大直径5.5厘米），其中一些显示冲击致暗。撞击熔岩岩块（无碎屑或碎屑稀少）也存在，且在铁镍金属与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.
地球化学特征：西北非 869 是一块风化壳角砾岩，含有太阳贵气体和预辐照岩性。岩块中的橄榄石：Fa0.2-49.2；基质中的橄榄石：Fa10.3-29.3；岩块中的低钙辉石（低-Ca）分支：Fs2.1-35.9；基质中的低-Ca辉石：Fs7.0-23.9。整批氧同位素：δ17O = 3.52；δ18O = 4.67；Δ17O = 1.09‰。地球年龄：4.4 ± 0.7千年。大气前 meteoroid 大小和质量：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 含有未平衡的碎屑，因此其分类修订为 L3-6。
This lot comes with certificate of authenticity.
本批样品附有鉴定证书。
Thanks for your interest.
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