Igneous Rock

Jasper

Jasper (Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide staining)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (likely Quartzose type)

Clastic sedimentary rock (primarily SiO2)

Quartzite with Iron Inclusions

Metamorphic Quartzite (SiO2 with Fe2O3 trace impurities)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 predominantly)

Mudstone

Lutylite (group of fine-grained sedimentary rocks)

Eclogite

Eclogite (Pyrope garnet and Omphacite pyroxene)

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Limestone (specifically Iron-stained or Argillaceous Limestone)

Calcium Carbonate (CaCO3) with Iron Oxide (Fe2O3) impurities

Ocherous Sandstone (Ferruginous Sandstone)

Ferruginous Arenite (SiO2 with Fe2O3)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Limestone

Calcium Carbonate (CaCO3)

Ferruginous Sandstone (with possible Epidote/Chlorite coloring)

Sandstone (SiO2 dominated with Fe2O3 staining)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)

River Rock (likely Quartzite or Chert)

Quartzite (primarily SiO2)

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

Quartzite Pebbles

Meta-quartzite (SiO2)

Sandstone (likely Arkose)

Arenite (composed mainly of SiO2 with Feldspar)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Limestone

Calcite (CaCO3)

Rough Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Quartz Geode

Silicon Dioxide (SiO2)

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Turquoise in Matrix

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Sodalite

Na8(Al6Si6O24)Cl2

Quartzite Pebble

Quartzite (composed primarily of Silica, SiO2)

Arfvedsonite in Quartz (also known as Eudialyte/Garnet Syenite variety)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2] within a silicate matrix

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)

Banded Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Shale

Fissile Mudstone (Shale)

Serpentine

Serpentine group ((Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Glauconite (Glauconitic Sandstone)

Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]