Silica
Silica, or silicon dioxide (SiO2), is an oxide comprising one silicon atom and two oxygen atoms. Quartz is a type of silicon dioxide and silica are major components of sand.

In 2267, Gothos was an iron-silica celestial body. ()

In 2370, the emergent lifeform developing in the  cargo bay was made out of silica polymers, duranium and several unidentified compounds. ()

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Chemical compounds