Igneous intrusions and metamorphism in some phosphatic rocks of southwestern Montana

Phosphate Minerals in Terrestrial Igneous and Metamorphic Rocks

“…Apatite occurs in garnet granulite, garnet websterite and eclogite xenoliths of lower crustal origin in kimberlites (Griffin et al 1979). Apatite has been described from contact metamorphism of carbonates such as Magnet Cove (McConnell and Gruner 1940) and Crestmore (Eakle and Rogers 1914) and from contact metamorphism of phosphate-rich sediments (Lowell 1955).…”