Basic information: Name: Los Vientos 171 Classification: LL3.1 Observed fall: NoYear found: 2016 Country: Antofagasta - Chile Mass-TKW: 20.22 kg ___________________________ Dimension: ~165x140x47mm Weight: 1750g Meteoritical ...more
Basic information: 19°3.728’N, 54°44.665’E Name: Dhofar 2066 State/Prov/County: Zufar, Oman Classification: Carbonaceous chondrite (Ungrouped) Observed fall: NoYear found: 2010 Mass - (TKW): 13g _______________________ Weight: ...more
Name: Dhofar 2066
State/Prov/County: Zufar, Oman
Classification: Carbonaceous chondrite (Ungrouped)
Observed fall: No
Year found: 2010
Mass - (TKW): 13g
Physical characteristics: Dark irregular stone. Cut surface reveals a dark-gray interior with well-defined chondrules.
Petrography: Well-defined chondrules (average apparent diameter 620±280 μm, N=25) set in abundant fine-grained iron-rich matrix. Olivine is the dominant mineral. No orthopyroxene was found. Opaque are mostly sulfides. Magnetite and metallic FeNi are also present. XRD of a 95 mg powdered sample (D. Borschnek, B. Devouard, CEREGE) does not reveal the presence of hydrous phases (serpentine, tochilinite) typically observed in type 2 chondrites using the same experimental setup.
Geochemistry: Olivine in the range Fa0.3-8.7, average Fa1.7±2.3 (N=10), CaO 0.30±0.14 wt%, Cr2O3 0.27±0.10 wt%. Olivine is zoned. Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.6 mg aliquot of a powdered 60 mg bulk sample is δ17O=10.91, δ18O=21.97 , Δ17O=-0.55 per mil (linearized, slope 0.5247, analytical uncertainties 0.08, 0.12, 0.03 per mil respectively).
Classification: Carbonaceous chondrite (C-ung). Moderate weathering. The anomalous designation is based on oxygen isotopes, and unusual mineralogy (absence of orthopyroxene, olivine composition, metal abundance). Possibly paired with Dhofar 955 and Dhofar 735, found within 1 and 3 km, respectively.
Oxygen isotope composition of CI and CM chondrites.