Description: Hello, up for sale is my newest classification, "Hassi Khebi," classified as an ultra rare C3-ungrouped. This meteorite is provisional and not yet approved in Meteoritical Bulletin. This gorgeous endcut weighs 3.778 grams, with nice polish to one side. The saw cut surface reveals scattered, well-formed chondrules set in a black matrix that makes up over 50% of this meteorite. Some of the chondrules appear to have orange iron-staining. Rare small CAIs are visible. Classification: Carbonaceous chondrite ungrouped (C3). Oxygen isotopic compositions are significantly displaced below the CCAM, indicating ungrouped carbonaceous chondrite. Type 3 based on a predominantly anhydrous matrix and Cr2O3 content of olivine. This meteorite comes with a COA card and display case. Thanks for your interest and take care. ***Calcium aluminum inclusions (CAIs) are white, millimeter-sized objects found, often together with chondrules, in the most primitive kinds of chondrite meteorites, notably some types of carbonaceous chondrite. They consist of high-temperature minerals, including silicates and oxides of calcium, aluminum, and titanium. In 2002, an international team of scientists accurately dated CAIs at 4.57 billion years, making them the oldest known objects in the solar system. The same team found that chondrules, another of the earliest relics of the solar system, are 2 to 3 million years younger than CAIs. Both types of object formed when dusty regions of the solar nebula were heated to high temperatures. The dust melted and then crystallized, forming first CAIs and then chondrules. Larger objects, like asteroids and planets, formed about 10 to 50 million years later*** Hassi Khebi 001 Algeria Purchase Date: August 2022 Mass: 500 g Type specimen mass: 20 g Pieces: Many Class: C3-ung Shock: Low Weathering grade: Low Fa: 1.31.4 Fs: 1.60.8 Wo: 1.61.5 Classifier: C. Agee, UNM Type spec loc: UNM History: Purchased by Matthew Stream from an Algerian meteorite dealer in August 2022. Physical: Dark gray/black fusion-crusted exterior, saw cut surface reveals scattered well-formed chondrules set in a black matrix that makes up over 50% of this meteorite. Some of the chondrules appear to have orange iron-staining. Rare small CAIs are visible. Petrography: (C. Agee and M. Spilde, UNM) Electron microprobe examination reveals a fine-grained matrix that gives slightly low microprobe totals (~95%) consistent with the absence of significant hydrous phases. Most chondrules are porphyritic type I with predominantly forsteritic olivines and enstatitic pyroxenes. Apparent mean chondrule diameter is 275227 um (n=50). Kamacite and Fe-Ni sulfide are the dominant opaque phases. Cr-magnetite was not detected. Vesicular fusion crust is 200-300 um thick. Geochem: (M. Spilde and C. Agee, UNM) Type I chondrule olivine Fa1.31.4, Cr2O3=0.340.16 (wt%) n=24; low-Ca pyroxene Fs1.60.8Wo1.61.5, n=9; matrix (20 um defocused microprobe beam) SiO2=31.55.3, TiO2=0.320.66, Cr2O3=0.430.14, Al2O3=4.43.6, FeO=29.69.7, MgO=15.73.7, CaO=3.03.4, NiO=1.60.3, MnO=0.210.07, Na2O=0.180.05, K2O=0.270.15, SO3=7.33.6 (all wt%), n=7; fusion crust, proxy from bulk composition (20 um defocused microprobe beam) SiO2=43.52.5, TiO2=0.170.01, Cr2O3=0.580.04, Al2O3=4.20.5, FeO=19.54.0, MgO=28.22.5, CaO=3.10.3, NiO=0.100.07, MnO=0.350.01, Na2O=0.830.12, K2O=0.070.01 (all wt%), n=7. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave d18O=-6.509,-7.235,-9.497; d17O=-1.497,-2.483,-5.165. Classification: Carbonaceous chondrite ungrouped (C3). Oxygen isotopic compositions are significantly displaced below the CCAM indicating ungrouped carbonaceous chondrite. Type 3 based on a predominantly anhydrous matrix and Cr2O3 content of olivine. Specimens: 20 g on deposit at UNM, Matthew Stream holds the main mass. Submitter: C. Agee
Price: 375 USD
Location: Riverside, California
End Time: 2025-01-17T01:19:42.000Z
Shipping Cost: 9 USD
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