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Dar al Gani 670 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Dar al Gani 670 This is an OFFICIAL meteorite name. Abbreviation: DaG 670 Observed fall: No Year found: 1999 Country: Libya Mass: 1619 g | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 318 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 84:
Dar al Gani 670 Libya Found 1999 Martian basalt (shergottite) A dark-brown stone, broken into three adjoining pieces, with a total mass of 1619 g was found in the Dar al Gani region. Mineralogy and classification (L. Folco, MNA-SI): centimeter-sized patches of fusion crust are present on the external surfaces; porphyritic texture consisting of millimeter-sized phenocrysts of brown olivine (Fo58–80) set in a fine grained basaltic groundmass of tabular pyroxene and interstitial feldspathic glass (An52–72Or0–1); pyroxene is primarily pigeonite (En56–66Wo9–13) with subordinate enstatite (En73–82Wo2– 3) and augite (En48–50Wo31–36); other minerals are chromite, titanian chromite, ilmenite, merrillite, and pyrrhotite; shock features include strong mosaicism and planar deformation in olivine, undulose extinction and twinning in pyroxene, and abundant impact-melt pockets and veinlets; pervasive veins filled in by calcite are due to terrestrial weathering. Oxygen isotopes (A. Sexton and I. A. Franchi, OU): δ17O = +2.83‰, δ18O = +4.95‰, Δ17O = +0.26‰. The petrography and level of terrestrial weathering are essentially identical to those of DaG 476 and DaG 489, and the three are very likely paired. Specimens: main mass with anonymous finder; 11.9 g and one polished thin section at MNA-SI. | ||||||||||||||||||||||||||||||||
Data from: MB84 Table 8 Line 95: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||||
Institutions and collections |
MNA-SI: Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, I-53100 Siena, Italy; Website (institutional address; updated 13 Dec 2011) OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 84, MAPS 35, A199-A225 (2000)
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Geography: |
Statistics: This is 1 of 1550 approved meteorites from Libya (plus 23 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||||
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Revision history: |
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