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MOSASAURIDAE
In the same matrix you can also see a tooth of Platecarpus ptychodon (mosasaurus species) and what appears to be a rib fragment or the transverse process of another vertebra just below the neural spine of the main vertebra
by biotite
The major silicate mineral is olivine
20996-31 - NWA Possible Achondrite Meteorite of Basaltic composition. In study. 103.6g Corals MOSASAURIDAEPetrographic description Under petrographic microscope, the sample is maily formed by clinopyroxene phenocrysts (Fig. 2), and, in a minor proportion, by orthopyroxenes and highly altered feldspars in a fine grained matrix. The rock is altered, with plagioclase phenocrysts transformed to albite and sericite (Fig. 3). Clinopyroxene is augite, showing several cracks and deformation twins. The matrix is formed by very fine grained plagioclase, K feldspar