Formed or generated in place. Said of rocks or minerals formed at the spot where they are now found.

minerals that form in situ in sediments after deposition.

Formed or generated in place; specif. said of rock constituents and minerals that have not been transported or that crystallized locally at the spot where they are now found, and of minerals that came into existence at the same time as, or subsequently to, the formation of the rock of which they constitute a part. The term, as used, often refers to a mineral (such as quartz or feldspar) formed after deposition of the original sediment.

Refers to rocks/minerals which were formed or were generated in place.

Generated or formed in place. Specifically used with rock minerals and other constituents that were derived locally, and of minerals that precipitated at the same time, or subsequent, to the rock in which they are found.