Not A Natural Rock

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Sandstone Pebble

Arenite (primarily SiO2)

Amethyst

Amethyst (SiO2 with Iron impurities)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 impurities)

Sandstone (likely Quartzose Sandstone)

Arenite

Pink Dyed Agate

Chalcedony (SiO2) with artificial dyes

Sandstone (likely Ferruginous)

Arenite (SiO2 based with Fe2O3/FeO(OH) cement)

Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)

Mixed Silicates and Oxides (predominantly SiO2 group minerals)

Sandstone

Clastic Sedimentary Rock (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar)

Sandstone

Arenite (SiO2-rich)

Granite

Phaneritic Plutonic Felsic Rock

Ferruginous Sandstone (Ironstone Nodules)

Ferruginous Quartz-Arenite (with Goethite/Hematite cement)

Granite

Phaneritic Igneous Rock (Granite)

Picture Jasper

Silicon Dioxide (SiO2)

Basalt

Mafic Igneous Rock

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide staining/cementing)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Glauconite (Glauconitic Sandstone)

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Petoskey Stone

Hexagonaria percarinata

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Shale

Fissile Mudstone

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Sandstone (Quartz-rich)

Sandstone (SiO2 dominated)

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Shale

Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Sandstone (Ferruginous)

Arenite with Iron Oxide (Fe2O3) cement

Dyed Pink Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Dyed Pumice

Vesicular Rhyolite (Artificial Coloration Addition)

Sandstone (Graywacke type)

Clastic Sedimentary Rock (Lithic Sandstone)