https://bereket-haileab.geology.sites.carleton.edu/files/original/be4ce6d8c5b0126f7a4f471dee880c3a.jpg b94e1024127717980d446a9ff01641aa Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Metamorphic Rocks Subject The topic of the resource This collection includes slates, phyllites, schists, gneisses, eclogites, marbles, quartzites, skarns, granulites, and mylonites. Creator An entity primarily responsible for making the resource Bereket Haileab Source A related resource from which the described resource is derived Housed in Anderson Hall, Carleton College. Format The file format, physical medium, or dimensions of the resource Thin sections, thin section scans, hand samples, hand sample images, photomicrographs, chemical analyses (major elements, trace elements and REE analyses for selected samples). Thin section and hand sample Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource BH250-100d Subject The topic of the resource Morton Gneiss Saprolite Creator An entity primarily responsible for making the resource Bereket Haileab Source A related resource from which the described resource is derived From the rock collection of Bereket Haileab. Sample 100d. Housed at Carleton College in Minnesota. Type The nature or genre of the resource Thin section and hand sample Relation A related resource <iframe width="100%" height="480" src="https://drive.google.com/file/d/1ZUxIutARyFAutj7cLfjUADwYjZaJAL1r/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1IYc9HMlN-M20cAl7T_nB8-5JwByv5w1f/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1Ox7z5csyTdSPbYh-dTLiww7-lYF1gjfc/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1fEzKQ0uju82UkN65RL4p6Rsc4C8VVFcE/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1fJQOkrmVOFABWVQXad-IMgHJ7t9wNJVh/preview" allow="autoplay"></iframe> Description An account of the resource The Morton Saprolite near Redwood Falls, Minnesota, formed through deep chemical weathering of the Precambrian Morton Gneiss, one of the oldest rock units on Earth. As the gneiss weathers, it produces a distinctive mineral assemblage including quartz, kaolinite, sericite (white mica), gibbsite, goethite, and hematite. Despite extensive mineralogical alteration, the saprolite preserves the original fabric and banding of the gneiss — a hallmark feature of saprolitic weathering. The weathered material is typically reddish to yellowish-brown, reflecting the abundance of iron oxides. This saprolite has been the subject of multiple geochemistry student research projects, particularly focusing on its mineralogy, weathering processes, and geochemical evolution. Documentation and findings from these student studies are available through resources linked on this website. This rock/saprolite is the least weathered Morton Geniss. Several student projects have explored this subject; please refer to the papers, abstracts, and posters available on the Geochemistry of Natural Waters website. For more discussion on the Morton Saprolite see BH250-100 Clay Mineral Clay Mineral Formation Deep Chemical Weathering Element Mobility Feldspar weathering Geochemical Weathering Gibbsite Goethite Hematite Hydrolysis Immobile Element Concentration Kaolinite Leaching metamorphic Minnesota Minnesota River Valley Morton Gneiss Paleosaprolite Potassium Loss Precambrian Rare Earth Element (REE) Enrichment Redwood Falls Redwood Falls Minnesota Regolith Residual Soil saprolite Saprolitic Weathering Sericite Sericite Separation Silica Depletion Southwestern Minnesota Weathered Gneiss White mica