Denader 004, καρβονώδης CB. Εκπληκτικό Μάτριξ με τεράστια σιδηρούχονδροειδή σφαιρίδια. - 0.73 g - (1)
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Denader 004, μετεωρίτης CB με πανέμορφη μήτρα και μεγάλους χονδροειδείς σιδηρούς χονδροειδείς, προελεύση Gao, Mali, βάρος 0,73 g.
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Περιγραφή από τον πωλητή
Denader 004 20°08'08.9"N, 4°56'22.8"W
Gao, Mali
Classification: Carbonaceous chondrite (CB)
History: The meteorite was found during a search in Mali and subsequently purchased from a local dealer.
Physical characteristics: Several fragments, up to few centimeters in size, with prominently exposed brownish metal nodules in a grayish silicate matrix plus many loose spheres that weathered out.
Petrography: Metal-rich breccia composed of about 40% rounded to ellipsoidal shaped kamacite-dominated metal nodules (apparent diameter 2.5±1.3 mm, n=31) and about 60% silicate groundmass consisting of radial and finely barred chondrules (up to 4 mm in size) plus chondrule and mineral fragments in a fine-grained matrix. Metal nodules are polycrystalline and contain abundant blebby and elongated Cr-bearing troilite inclusions often decorating kamacite grain boundaries. Dominant silicates in chondrules and matrix are enstatite and forsterite with subordinate zoned olivine, ferroan low-Ca pyroxene, and aluminous diopside. Minor phases in the matrix include Cr-bearing spinel, magnetite, troilite, kamacite, taenite, and schreibersite. No refractory inclusions detected. The meteorite is moderately weathered and many metal nodules are surrounded by a thin iron hydroxide rim.
Geochemistry: forsterite: Fa2.7±0.1 (Fa2.7-2.8, n=7); zoned olivine: Fa17.9±2.5 (Fa14.7-22.0, n=7); enstatite: Fs2.0±0.1Wo0.6±0.1 (Fs2.0-2.1Wo0.5-0.6, n=7); ferroan low-Ca pyroxene: Fs19.2±0.1Wo0.6±0.2 (Fs19.1-19.3Wo0.4-1.0, n=7); aluminous diopside: Fs2.4±0.2Wo41.7±0.7 (Fs2.3-2.7Wo40.6-42.5, n=7); kamacite is Si-free and contains 5.95±0.20 wt% Ni, 0.26±0.03 wt% Co, and 0.40±0.02 wt% P, n=7 and troilite inclusions contain up to 5.6 wt% Cr.
Classification: Carbonaceous chondrite (CB). The high abundance of silicate portions (60% vs. less than 50% in CBa and less than 30% in CBb), diameter of chondrules (up to 4 mm vs. cm sized in CBa and 0.2-1 mm in CBb), the presence of fine-grained matrix, and the occurrence of zoned olivine plus ferroan pyroxene does not allow an unambiguous assignment to a known subgroup.
Shock stage: low
Weathering grade: moderate
Classifier: A. Greshake, MNB.
This lot comes with certificate of authenticity.
Thanks for your interest.
Denader 004 20°08'08.9"N, 4°56'22.8"W
Gao, Mali
Classification: Carbonaceous chondrite (CB)
History: The meteorite was found during a search in Mali and subsequently purchased from a local dealer.
Physical characteristics: Several fragments, up to few centimeters in size, with prominently exposed brownish metal nodules in a grayish silicate matrix plus many loose spheres that weathered out.
Petrography: Metal-rich breccia composed of about 40% rounded to ellipsoidal shaped kamacite-dominated metal nodules (apparent diameter 2.5±1.3 mm, n=31) and about 60% silicate groundmass consisting of radial and finely barred chondrules (up to 4 mm in size) plus chondrule and mineral fragments in a fine-grained matrix. Metal nodules are polycrystalline and contain abundant blebby and elongated Cr-bearing troilite inclusions often decorating kamacite grain boundaries. Dominant silicates in chondrules and matrix are enstatite and forsterite with subordinate zoned olivine, ferroan low-Ca pyroxene, and aluminous diopside. Minor phases in the matrix include Cr-bearing spinel, magnetite, troilite, kamacite, taenite, and schreibersite. No refractory inclusions detected. The meteorite is moderately weathered and many metal nodules are surrounded by a thin iron hydroxide rim.
Geochemistry: forsterite: Fa2.7±0.1 (Fa2.7-2.8, n=7); zoned olivine: Fa17.9±2.5 (Fa14.7-22.0, n=7); enstatite: Fs2.0±0.1Wo0.6±0.1 (Fs2.0-2.1Wo0.5-0.6, n=7); ferroan low-Ca pyroxene: Fs19.2±0.1Wo0.6±0.2 (Fs19.1-19.3Wo0.4-1.0, n=7); aluminous diopside: Fs2.4±0.2Wo41.7±0.7 (Fs2.3-2.7Wo40.6-42.5, n=7); kamacite is Si-free and contains 5.95±0.20 wt% Ni, 0.26±0.03 wt% Co, and 0.40±0.02 wt% P, n=7 and troilite inclusions contain up to 5.6 wt% Cr.
Classification: Carbonaceous chondrite (CB). The high abundance of silicate portions (60% vs. less than 50% in CBa and less than 30% in CBb), diameter of chondrules (up to 4 mm vs. cm sized in CBa and 0.2-1 mm in CBb), the presence of fine-grained matrix, and the occurrence of zoned olivine plus ferroan pyroxene does not allow an unambiguous assignment to a known subgroup.
Shock stage: low
Weathering grade: moderate
Classifier: A. Greshake, MNB.
This lot comes with certificate of authenticity.
Thanks for your interest.
Λεπτομέρειες
Αριθμός αντικειμένων
1
όνομα μετεωρίτη
Denader 004, Carbonaceous CB.
τύπος μετεωρίτη
Stunning Matrix with huge iron chondrules.
Συμπληρωματικά στοιχεία
Do not reserve price.
Βάρος
0.73 g
Προέλευση (Περιοχή / Πόλη)
Gao
Χώρα
Μάλι
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