Ksar Ghilane 022，是未分组的无球粒陨石。 其起源在最近的科学研究中存在争议。 - 1.25 g

Ksar Ghilane 022 (KG 022) 32.559°N, 9.508°E

Tatawin, Tunisia

Purchased: 2023

Classification: 未分组的无球粒陨石

History: 于2023年在突尼斯发现。2023年2月和11月由 Libyan 商人向 Adam Aaronson 购买。随后在2024年2月向 Craig Zlimen（图森 gem and mineral 展览会）提供了材料中的若干部分，随后被 Robert Ward、Brian Caress 和 Ben Hoefnagels 收购。

Physical characteristics: 一块大石（25 kg）及与之一起发现的许多小块。大多数石块缺乏熔融地壳，表面呈现花斑状、暗灰与浅灰色的颗粒状纹理。然而，部分石块部分被黑色熔壳覆盖。石块内部呈现出等颗粒的浅灰与白色颗粒的均匀集合体的外观。

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) 标本主要（>90体积%）由几乎端元的透辉石组成（多为等角颗粒，平均粒径约1.5 mm），伴随少量透辉石和微量的Cr-镁铌铁矿、达布雷石、阿拉班石以及锰-铁氧体相。透辉石晶粒中存在小的不规则包裹体或稀疏的细层状结构，透辉石晶粒的不同宏观颜色显然反映了硫化物包裹体浓度的差异。整个样品中存在一些二次方解石脉。

Geochemistry: 透辉石（Fs0.0-0.1Wo39.4-42.3, N = 3），透辉石（Fs0.1±0.0Wo0.9-3.6, N = 3）。氧同位素（K. Ziegler, UNM）：用激光氧化法对酸洗子样品的分析结果分别为 δ17O 3.018, 2.926；δ18O 5.781, 5.559；Δ17O -0.034, -0.009 毫珍单位（所有数据线性化，TFL 斜率 = 0.528）。

Classification: Achondrite (ungrouped, Mg-rich clinopyroxenite). This meteorite is texturally and mineralogically very similar to ungrouped augite-rich achondrite NWA 15915. but does not exhibit the same degree of irrational exsolution of enstatite from the dominant constituent augite. Terrestrial pairing is further excluded by the different physical appearance of these two meteorites, different degree of weathering, and the fact that their purported find sites are hundreds of kilometers apart. Both of these meteorites may have some affinities to aubrites, but differ in being composed predominantly of almost Fe-free augite rather than enstatite.

Specimens: 41.3 g including one polished thin section at UWB; 677 g with Mr. R. Ward; 770 g with Mr. B. Caress; 674 g with Mr. B. Hoefnagels; 800 g with Mr. D. Dickens; remainder including the 25 kg main mass with Aaronson.

Shock stage: low
Weathering grade: low
Classifier: A. Irving, UWS, and P. Carpenter, WUSL

This lot has no reserve price and comes with its certificate of authenticity.
Thanks for your interest.