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Erg Chech 002 Meteorite **Classification:** Ungrouped Achondrite **Origin:** Unknown **Location Found:** Erg Chech Sand Sea, near Bir Ben Takoul, southern Algeria **Coordinates:** 26.032N, 1.611W **Date of Discovery:** May 2020 **Weight:** 4.082 gram endcut **Notable Features:** Stunning green crystals, unique lithology, and odd inclusions **Age:** Estimated to be over 4.5 billion years The **Erg Chech 002** meteorite has generated significant excitement within the meteorite community due to its unique characteristics and mysterious origin. Classified as an **ungrouped achondrite**, this meteorite does not fit into any known categories of meteorites, leading to speculation about its provenance. The prevailing theory among researchers is that it may have originated from a terrestrial bodylikely an asteroid or celestial object that has since been fragmented or destroyed. Upon its discovery in May 2020, Erg Chech 002 revealed a captivating composition marked by striking green crystals, which contribute to its stunning visual appeal. The meteorite also exhibits a distinctive lithology and intriguing inclusions, making it a fascinating subject for both collectors and scientists alike. As an ancient artifact of our solar system, Erg Chech 002 is estimated to be over **4.5 billion years old**, suggesting that it has existed since the formative years of our planetary system. When purchasing this remarkable specimen, it will come with a Certificate of Authenticity (COA) from « Streaming Meteorites, » along with an attractive display case, allowing collectors to showcase this extraordinary piece of cosmic history. Thank you for your interest in this exceptional meteorite! Erg Chech 002 is classified as an andesitic achondrite, making it one of the oldest known types of stony meteorites. Notable for its numerous fragments containing distinctive large greenish crystals, this meteorite provides valuable insights into the early Solar System. A key aspect of its significance lies in its age, which has been determined to be approximately 4.566 billion years old through lead-207-lead-206 isotopic analysis. This ancient meteorite offers researchers an opportunity to investigate the distribution of aluminum-26, a short-lived radionuclide that was a major heat source for early planetary melting. The presence and distribution of aluminum-26 in the early Solar System is a topic of debate among scientists, as it plays a crucial role in the age determination of meteorites and the understanding of our celestial history. According to researchers from the Australian National University, the presence of aluminum-26 and its effects on early planetary processes were predicted more than 60 years ago. Subsequent studies have shown that aluminum-26 is ubiquitous in calcium-aluminum-rich inclusions (CAIs), chondrules, and achondrites, confirming its role during the formation of these early solar materials. The research on Erg Chech 002 indicates that aluminum-26 may have been unevenly distributed in the early Solar Nebula, likely linked to the later accretion of stellar materials that harbored freshly synthesized radionuclides. This underscores the need for caution in meteorite chronology studies, suggesting that a generalized approach should be adopted for dating using short-lived isotopes. Met Bull says: Basic information Name: Erg Chech 002 This is an OFFICIAL meteorite name. Abbreviation: EC 002 Observed fall: No Year found: unknown Country: Algeria Mass: 22.86 kg Classification history: Recommended: Achondrite-ung Comments: Approved 19 Jul 2020 Writeup from MB 109: Erg Chech 002 (EC 002) 26.032N, 1.611W Adrar, Algeria Find: 2020-May Physical characteristics: The stones under classification (combined weight 22,855 g) lack fusion crust, and have an overall relatively coarse grained, tan and beige appearance with sporadic larger green, yellow-green and less commonly yellow-brown crystals (up to 9 cm by 4 cm in some specimens). Some minor reddish-brown staining is evident in the groundmass regions. This classification is based on direct analysis of samples from the 1839 g stone augmented by examination of photographs and descriptions of other stones found with them. Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Unbrecciated igneous texture. Sporadic pyroxene megacrysts (ranging in size from 1.7 to 11.5 mm in the studied thin section), exhibiting angular or ellipsoidal and embayed shapes, and comprising orthopyroxene (of varying composition), pigeonite and augite occur within a dominant, medium to relatively coarse grained groundmass. The cores of each of the analyzed megacrysts are fairly homogeneous in composition, but all are mantled by zones of different composition and distinct, fine grained rim overgrowths against the groundmass parallel to grain outlines (irrespective of geometry). Some low-Ca pyroxene cores contain thin lamellae and some larger inclusions (up to 300 m) of Ti-poor chromite. The groundmass representing the major portion of the specimens (mean grainsize ~1.5 mm) is composed predominantly of exsolved pigeonite (commonly as radiating clusters of prismatic grains) and lath-like sodic plagioclase (zoned from irregular oligoclase cores to albitic rims with oriented dagger-like K-feldspar exsolution blades) together with accessory Ti-chromite, ilmenite (some as rims on chromite), troilite, silica polymorph (with a curved « fish-scale » fracture pattern suggestive of cristobalite), merrillite, and rare Ni-poor metal (in composite grain clusters with ilmenite, Ti-chromite and troilite). Secondary weathering products include minor goethite after primary troilite and metal, and sporadic very thin veinlets of calcite. Geochemistry: Orthopyroxene megacryst #1 (core Fs17.7Wo3.3; mantle Fs23.4-31.1Wo3.4-3.8; rim Fs37.6-42.5Wo2.9-3.3; FeO/MnO = 21-26, Cr2O3 = 0.3-0.5 wt.%; N = 6), orthopyroxene megacryst #2 (core Fs14.40.0Wo2.2-2.3; mantle Fs19.2-28.7Wo2.0-2.1; rim Fs33.1-36.8Wo2.8-3.5; FeO/MnO = 17-26; Cr2O3 = 0.3-1.0 wt.%; N = 7), orthopyroxene megacryst #3 (core Fs22.8Wo1.2; mantle Fs30.8Wo2.2; rim Fs43.5Wo2.5; FeO/MnO = 16-23; Cr2O3 = 0.2-0.4 wt.%; N = 3), pigeonite megacryst (core Fs21.3Wo7.0; mantle Fs23.4Wo11.8; rim Fs40.7Wo5.0; FeO/MnO = 17-20; Cr2O3 = 0.3-0.8 wt.%; N = 3), augite megacryst (core Fs14.7-19.4Wo38.5-30.2; rim Fs24.7Wo38.1; FeO/MnO = 15-18; Cr2O3 = 1.1 wt.%; N = 4), groundmass exsolved pigeonite (low-Ca pyroxene host Fs42.3-52.2Wo2.9-4.6, FeO/MnO = 21-23, N = 6; augite exsolution lamellae Fs18.1-25.9Wo40.8-38.1, FeO/MnO = 18-22, N = 5), groundmass plagioclase (oligoclase cores and intergrown with pyroxene megacrysts Ab68.8-79.0An26.7-17.9Or4.4-2.6, N = 6; albitic rims on laths Ab84.4-86.7An11.4-7.1Or4.2-7.0, N = 5), K-feldspar exsolution blade in albite (Or84.1Ab11.3An4.6), Fe metal (Ni = 0.13-0.18 wt.%, N = 2). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples of groundmass and an orthopyroxene megacryst by laser fluorination gave, respectively: groundmass 17O 1.548, 1.788, 1.831, 1.773; 18O 3.201, 3.657, 3.728, 3.593; 17O -0.142, -0.143, -0.137, -0.123 (linearized, all per mil, TFL slope = 0.528); megacryst 17O 1.780, 1.639, 1.682; 18O 3.594, 3.329, 3.379; 17O -0.117, -0.119, -0.103 (linearized, all per mil, TFL slope = 0.528). Magnetic susceptibility log ( 10-9 m3/kg) = 3.06. Classification: Achondrite (ungrouped, gabbroic with pyroxene megacrysts, sodic). Although the exsolved pigeonite in this meteorite is reminiscent of pyroxene in typical eucrites (with the notable exception of systematically much lower FeO/MnO ratios), the highly sodic and mildly potassic plagioclase is very different from the much more calcic plagioclase in eucrites (typically bytownite to anorthite, and only rarely as sodic as calcic labradorite Ab33An67). The cores of orthopyroxene megacrysts differ from typical diogenitic orthopyroxene in usually being more magnesian, more Cr-rich and having lower FeO/MnO ratios. Oxygen isotopes (17O values) plot between the field for the majority of eucrites and the trend for angrites, in the vicinity of values for anomalous eucrites Bunburra Rockhole, Emmaville, Asuka 881394 and EET 92023. However, Erg Chech 002 is mineralogically quite different from those four meteorites in many respects, most notably the prevalence of highly sodic plagioclase and lower FeO/MnO ratios in pyroxenes.

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