perigenic

perigenic

[¦per·ə¦jen·ik]
(geology)
Referring to a rock constituent or mineral formed at the same time as the rock it is part of, but not formed at the specific location it now occupies in the rock.
References in periodicals archive ?
1990): Glauconite formation: discussion of the terms authigenic, perigenic, allogenic, and meta-allogenic.