Mineral, Often Found As Detrital Grains In Sedimentary Rocks

Pyrite

Iron Sulfide (FeS2)

Conglomerate

Conglomerate (SiO2 primary clasts with lithic matrix)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron impurities

Limonite / Ironstone Nodule

Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O

Quartz Geode (with Calcite influence)

Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide/Hematite)

Quartzite

Quartzite (primarily SiO2)

Chalcedony (Commonly known as Carnelian or Agate pebble)

Microcrystalline Quartz (SiO2)

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals

Sandstone or Siltstone

Arenite (if sandstone)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Iron-stained Quartzite

Recrystallized Quartz (SiO2) with Hematite/Limonite staining

Greywacke (likely)

Greywacke (a type of sandstone)

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Ferruginous Sandstone (Grit)

Clastic Sedimentary (Ironstone-rich Sandstone)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Quartzite

Metamorphic rock (primarily SiO2)

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

Blue Calcite

Calcium Carbonate (CaCO3)

Fossiliferous Shale (with Vertebrate Bones)

Laminated Mudstone containing Fossilized Bone (Apatite)

Greywacke (River Siltstone)

Lithic Sandstone / Greywacke

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Green Sandstone

Glauconitic Sandstone

Sandstone

Arenite (SiO2 primarily)

Jasper

Jasper (Silicon Dioxide, SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Celestite (Celectine)

Strontium sulfate (SrSO4)

Sandstone Pebble (Quartzite-rich)

Clastic Terrigenous Sedimentary Rock (SiO2 dominant)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Red Sandstone (Old Red Sandstone)

Ferruginous Sandstone (SiO2 + Fe2O3)

Granite (Fine-grained)

Phaneritic Felsic Igneous Rock

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.