-將星比心-
-將星比心-











-將星比心-
 
利比亞
 1997年發現
火星玄武岩(shergottite)
A dark-brown stone of 2146 g was found in Dar al Gani. Mineralogy and classification: devoid of fusion crust; porphyritic basaltic texture consisting of millimeter-sized phenocrysts of brown olivine (Fo61–78, Mn/Fe = 0.021–0.025 atomic) set in a more fine grained matrix of pigeonite laths (En57–72 Wo5–15, Mn/Fe = 0.030–0.038 atomic) and interstitial feldspathic glass (An56–67Ab33–43); minor mineral components include augite, chromite, Ti-rich chromite, ilmenite, merrillite and pyrrhotite; texture, mineral modes and chemistry close to EETA79001 lithology A; shock deformation features include twinning in pigeonite, strong mosaicism and planar deformation features in olivine, and abundant impact-melt pockets and veinlets; pervasive veins filled in by calcite are due to terrestrial weathering. Oxygen isotopes: 17O = 2.895, 18O = 4.980, and 17O = 0.305‰. The petrography, mineralogy, and noble gas chemistry of DaG 476 and DaG 489 are very similar, and the two are likely paired.


 
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