20998-14 - NWA Possible Achondrite Meteorite Porphyritic Basalt. In study. 233g Native copper Streckeisen

Streckeisen

A vertebra is also seen in the same matrix

vertical sulci on medial and lateral faces

Cephalopoda - Ammonitida - Acanthoceratidae

20998-14 - NWA Possible Achondrite Meteorite Porphyritic Basalt. In study. 233g Native copper StreckeisenPetrographic description Under petrographic microscope, the sample is formed by phenocrysts mostly of olivine, clinopyroxene, plagioclase and in a smaller proportion quartz and orthopyroxene in a fine matrix (Figs. 2 and 3). The texture is porphyritic. Amygdules are scarce in the sample and are filled by calcite. The olivine grains are embayed and partially reabsorbed. Pyroxene crystals show complex zoning patterns, range from concentric to patchy.