#andy weir

For those interested, the igneous phenotype is inspired by granitic pegmatites, with hexagonal beryl crystals growing from it (of the aquamarine variety)

The sedimentary fella is a BIF, or a banded iron formation - a type of chemical sedimentary rock recording the years following the Great Oxygenation Event, with alternating bands of red jasper and magnetite/iron oxides:)

And the metamorphic eridian is inspired by an amphibolite, containing garnet gem porphyroblasts:)