Sedimentary Or Igneous Fragment

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Red Sandstone

Arenite (with Iron Oxide)

Sandstone (Red Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)

Fossiliferous Limestone (Coquina / Shell Bed)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone with Brachiopod Mold

Calcium Carbonate (CaCO3) matrix containing Brachiopoda fossil impressions

River Pebble (Quartz/Sandstone)

Silicon Dioxide (SiO2) Mix

Quartz Geode

Silicon Dioxide (SiO2)

Limonite/Goethite (Iron Ore)

Hydrous ferric oxides (FeO(OH)·nH2O)

Red Sandstone Pebble

Arenite with Hematite (Fe2O3) cement

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Pyrite

Iron Sulfide (FeS2)

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Brown Variety)

Microcrystalline quartz (SiO2)

Chert (often called Flint for darker varieties)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Calamites (Fossilized Horsetail)

Calamites suckowii (Family: Calamitaceae)

Chert (specifically Yellow or Brown Chert / Jasper)

Silicon Dioxide (SiO2)

Sandstone

Sandstone (clastic sedimentary rock)

Fossilized Coral

Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Petrified Wood (Silicified Fossil)

Silicified Wood (SiO2)

Chert (often called Flint or Jasper locally)

Chert (Microcrystalline Quartz, Formula: SiO2)

Sandstone

Arenite (SiO2 with Fe2O3)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Dearest Ring (Gemstones)

Mixed Gemstones: Diamond (C), Emerald (Be3Al2Si6O18), Amethyst (SiO2), Ruby (Al2O3), Sapphire (Al2O3), Topaz (Al2SiO4(F,OH)2)

Schist

Mica Schist

River Quartz Cobble

Silicon Dioxide (SiO2)

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Milk Quartz (White) and Yellow Aventurine (Yellow)

Silicon Dioxide (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Ruby (set in a gold pendant)

Ruby (Variety of Corundum, Al2O3)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Iron Meteorite (Individual)

Siderite (composed of Kamacite and Taenite minerals)

Hematite

Iron(III) oxide (Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide staining)

Sandstone

Arenite (primarily SiO2)