x1=b1 becomes rock/is petrified/is fossilized/is transformed into a statue x2=r1=b2 (result) of composition x3=r2 at/from location x4=r3 under condition x5=b3
The process by which this happens is not specified and can be bio-geological (as with petrified trees) or magical (as with Medusa). x1 may not be biological. See also: rokybixmivborvelvi'u, rokybixygau