Quartz

Silicon dioxide (SiO4). For silica glass and optical memory. Often makes up most of a planet's crust.

Quartz (SiO2).

A silicate crystal named by the Polish. Quartz and feldspar make up most of Earth’s continental crust.

Used in the creation of fabricator-aligned glass and ultra-long-term computer memory storage lasting billions of years.

Typically found as phenocrysts formed from cooling lava — but some local deposits have a telltale bioplastic matrix.

Hypothesis: a local coral gathers dissolved silica to grow quartz deposits.