pyrogenetic
/ˌpʌɪrə(ʊ)dʒəˈnɛtɪk/adjective
Produced or generated by the action of fire or heat; (Geology ) (of a mineral) crystallizing directly from magma at high temperature.
Origin
Mid 19th century (in an earlier sense). From pyro- + -genetic. Compare earlier pyrogen, pyrogenic, pyrogenous.