21000-27 - NWA Possible Achondrite Meteorite Basaltic Composition. In study. 29 g Onchopristis teeth collections Journal of Paleontology 74 (2):

Journal of Paleontology 74 (2): 309–16

Sister taxa: Cimolichthys

†Dyrosaurus

clinopyroxene

21000-27 - NWA Possible Achondrite Meteorite Basaltic Composition. In study. 29 g Onchopristis teeth collections Journal of Paleontology 74 (2):Petrographic description Under petrographic microscope, the sample is a fine grained volcanic rock with olivine and pyroxene phenocrysts, surrounded by a fine grained matrix (Figs. 2 and 3). Phenocrysts show deformation, developing twins and cracks. Olivine grains have a thin rim (Figs. 2 and 3) of iddingsite (reddish border). Pyroxene is pale brown and presents some plagioclase inclusions. The matrix is formed by tabular euhedral plagioclase and