savikivistä
Savikivi, also known as argillite, is a sedimentary rock formed from compressed clay or mud. It is denser and harder than typical shale or mudstone due to the increased pressure and diagenesis it has undergone. Savikivi is characterized by its fine grain size, often showing a dull luster. Its color can vary widely, ranging from gray and brown to red and black, depending on the presence of various minerals and organic matter.
This rock type typically forms in low-energy depositional environments, such as deep marine basins or lakebeds,
Savikivi has historically been used in toolmaking, particularly for arrowheads, scrapers, and other lithic implements, due