rock+type

rock type Igneous rocks > Sedimentary Rocks > > > > Metamorphic Rocks >> >> >> >> >> >> >> silica
 * Basalt
 * granite
 * Clastics (Shale ,Sandstone)
 * Carbonates
 * Slate
 * Gneiss
 * Flint
 * Chert
 * Quartz



miscellaneous > > > > > > > >
 * Amber
 * Ochre