Carbonaceous chondrites are comparatively rich in mineralogically bound OH. The sandstones are composed of grains which are similar mineralogically to the underlying Franciscan Formation. These soils are expected to be mineralogically similar to their underlying bedrock. The ordinary chondrites comprise three mineralogically and chemically distinct groupings. Archean anorthosites are distinct texturally and mineralogically from Proterozoic anorthosite bodies. The stones of The Cove are mineralogically different from those in the nearby stone circles. Mineralogically, silt is composed mainly of quartz and feldspar.