Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)

Granite (Pink/Potassium Feldspar Granite)

Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)

Quartzite River Cobble

Quartzite (SiO2)

Limonite (Iron Stone)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Pink Granite

Phaneritic intrusive felsic igneous rock

Ironstone (likely Limonite or Goethite)

Ferruginous sedimentary rock (FeO(OH)·nH2O)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Mica Schist with Garnet

Garnetiferous Mica Schist

Ferruginous Quartz on Ironstone

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Dyed Agate

Silicon Dioxide (SiO2)

Gneiss (Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Petrified Wood

Silicified Wood (SiO2)

Chert (and Flint)

Silicon dioxide (SiO2)

Chert (specifically Gray/Blue-Gray Chert)

Chert (SiO2)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Green Quartzite (with Fuchsite)

Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

River Stone (Basalt or Siltstone with banding)

Polished Basaltic or Siliciclastic River Cobble

Bivalve Fossil (Clam/Mollusk)

Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Clear Quartz

Silicon Dioxide (SiO2)

Garnet (specifically Almandine)

Almandine - Fe3Al2(SiO4)3

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Jasper

Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)

Clear Quartz

Silicon Dioxide (SiO2)

Pink Dyed Agate

Silicon Dioxide (SiO2) with synthetic pigment

Black Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Blue Chalcedony (Tumbled)

Silicon Dioxide (SiO2)

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Limonite Concretion (Ironstone)

Limonite / Goethite (FeO(OH)·nH2O)

Glauconitic Sandstone

Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Flint (Chert)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Ammonite Fossil in Limestone Matrix

Ammonoidea (subclass) in Calcium Carbonate (CaCO3)