Sedimentary Like (Industrial Composite)

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Shale or Mudstone River Pebble

Argillaceous sedimentary rock

Bauxite

Bauxite (Aluminum Ore)

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Chert (Jasper)

Silicon Dioxide (SiO2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Fossiliferous)

Arenite / Clastic Sedimentary Rock

Geode (unopened)

Silica-filled Concretion (SiO2)

Satin Spar (Satin Spar Selenite)

Gypsum (CaSO4·2H2O)

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities

Red Sandstone

Arenite (predominantly Quartz with Hematite cementation)

Gneissic Schist

Foliated Metamorphic Rock (Schist/Gneiss transition)

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Sandstone

Arenite (SiO2 primarily)

Sandstone (with potential Concretion or Fossil fragment)

Arenite (primarily SiO2)

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert with Jasper and Quartz

Microcrystalline Quartz (SiO2)

Coarse Sandstone Pebble

Clastic Sedimentary Rock (Sandstone)

Sandstone (Pebble)

Arenite (primarily SiO2)

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (and Chalcedony)

Silicon Dioxide (SiO2)

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Sapphire (Corundum)

Corundum (Al2O3), variety Sapphire

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Sandstone

Arenite (primarily SiO2 with iron oxide cementation)

Sandstone

Arenite (primarily SiO2)

Feldspathic Gneiss (Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Fossilized Shark Tooth

Carcharocles sp. (likely Lemon or Sand Tiger)

Belemnite Fossil

Belemnitida (Order within Cephalopoda)

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Sandstone (with Iron Staining)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Sodalite (blue beads) and Clear Quartz (clear beads)

Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)

Sandstone

Arenite (primarily SiO2)