20999-59 - NWA Possible Achondrite Meteorite Porphyritic Basalt. In study. 192 g Invertebrates Beautiful plaque containing the remains

Beautiful plaque containing the remains of many stems of this species of moroccan crinoid (Scyphocrinites)

Alethopteridae

this specie must be studied and will have probably a new name

in a formal way

Accessory minerals are apatite and magnetite (Fig

20999-59 - NWA Possible Achondrite Meteorite Porphyritic Basalt. In study. 192 g Invertebrates Beautiful plaque containing the remainsPetrographic 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