 
 <prompt> ```
Di element from di periodic table of elements wey get atomic number of 8 na oxygen. Given di previous question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context:``` <response>: ```In di absence of atmospheric oxygen (O2), for deep geological conditions wey dey far from Earth atmosphere, hydrogen (H2) dey produce during di process of serpentinization by di anaerobic oxidation by di water protons (H+) of di ferrous (Fe2+) silicate wey dey present for di crystal lattice of di fayalite (Fe2SiO4, di olivine iron-endmember). Di corresponding reaction wey dey lead to di formation of magnetite (Fe3O4), quartz (SiO2) and hydrogen (H2) na as e follow:``` 