Ksar Ghilane 022，未分组的无球粒陨石。 它的起源一直是最近科学研究争议的焦点。 - 1.25 g

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

Tatawin，突尼斯

购买：2023

分类：未分组的非球粒陨石

History: Found in Tunisia in 2023. Purchased by Adam Aaronson in February and November 2023 from a Libyan dealer. Portions of the material were subsequently provided to Craig Zlimen at the Tucson Gem and Mineral Show in February 2024, and in turn acquired by Robert Ward, Brian Caress and Ben Hoefnagels.

史记：于2023年在突尼斯发现。由 Adam Aaronson 于2023年2月和11月从一名利比亚商人处购买。随后该材料的一部分于2024年2月在图森珠宝与矿物展向 Craig Zlimen 提供，随后由 Robert Ward、Brian Caress 和 Ben Hoefnagels 收购。

Physical characteristics: A single large stone (25 kg) and many smaller pieces found with it. Most of the stones lack fusion crust and have mottled, dark and light gray granular exteriors. However, several pieces are partly coated by black fusion crust. The interiors of the stones have the appearance of equigranular aggregates of light gray and whitish grains.

物理特征：一块大型石块（25 公斤）及其周围的许多较小碎块。大多数石块缺乏融合壳，表面呈斑驳的深灰和浅灰颗粒状外观。然而，若干碎块部分被黑色融合壳覆盖。石块内部呈现出等粒状的浅灰色与白色颗粒聚集体。

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) The specimen is composed predominantly (>90 vol.%) of almost end-member augite (mostly as equant grains, mean grainsize ~1.5 mm) accompanied by minor enstatite and accessory Cr-troilite, daubreelite, alabandite and an Mn-Fe oxide phase. Enstatite occurs as small irregular inclusions or sparse fine lamellae within augite grains, and different macroscopic colors of the augite grains apparently reflect differing concentrations of sulfide inclusions. Some secondary calcite veins are present throughout.

岩相描述：(A. Irving，UWS，以及 P. Carpenter，WUSL) 该标本主要由>90 体积百分比几乎端成员的辉石组成（多为等方晶粒，平均晶粒尺寸约1.5 mm），伴随少量橄榄石及少量的铬-透辉石、达布雷石、白榴石与锰-铁氧化物相。橄榄石以小不规则夹杂物或在辉石晶粒内的稀疏细片存在，不同宏观颜色的辉石晶粒显然反映了硫化物夹杂物含量的差异。全样品中存在一些次生方解石脉。

Geochemistry: Augite (Fs0.0-0.1Wo39.4-42.3, N = 3), enstatite (Fs0.1±0.0Wo0.9-3.6, N = 3). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 3.018, 2.926; δ18O 5.781, 5.559; Δ17O -0.034, -0.009 per mil (all data linearized, TFL slope = 0.528).

化学地球化学：辉石（ Fs0.0-0.1Wo39.4-42.3，N=3），橄榄石（Fs0.1±0.0Wo0.9-3.6，N=3）。氧同位素（K. Ziegler，UNM）：利用激光萃取法对酸洗亚样本的分析分别给出 δ17O 3.018、2.926；δ18O 5.781、5.559；Δ17O -0.034、-0.009 毫铂（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.

分类：非球粒陨石（未分组、镁富辉石斜长岩）。该陨石在晶粒学和矿物学方面与未分组的辉石富非球粒陨石 NWA 15915 非常相似，但未表现出主成分辉石中橄榄石的同位性极端分离程度。地球来源配对因此被排除，因为两者的外观、风化程度不同，且据称的发现地点相距数百公里。两者都可能与橄榴橄? aubrites 有某种亲缘关系，但不同之处在于前者几乎由铁含量极低的辉石为主，而非橄榄石。

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.

样本：41.3 g，包含在 UWB 的一个抛光薄片；677 g 与 R. Ward 先生；770 g 与 B. Caress 先生；674 g 与 B. Hoefnagels 先生；800 g 与 D. Dickens 先生；其余包括 25 kg 主质在 Aaronson。

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

冲击阶段：低
风化等级：低
分类者：A. Irving，UWS，和 P. Carpenter，WUSL

This lot has no reserve price and comes with its certificate of authenticity.

此批次无底价，并附有真实性证书。
Thanks for your interest.