Sedimentary (Chemically Precipitated)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz-encrusted Matrix

Silicon Dioxide (SiO2) with Ferruginous Sandstone

Red Jasper

Microcrystalline quartz (SiO2)

Banded iron formation (BIF)

Banded iron formation; chiefly hematite/magnetite and microcrystalline quartz (chert)

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Chert with Jasper/Quartz Inclusions

Silicon Dioxide (SiO2)

Chert (Jasper/Quartzite river pebble)

Microcrystalline Silica (SiO2)

Chert (White Variety)

Silicon Dioxide (SiO2)

Chert (Red Jasper)

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Pyrite-bearing sulfide specimen

Pyrite (FeS₂), possibly with chalcopyrite and quartz or carbonate gangue

Ferruginous Quartz

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

Hematite

Iron(III) oxide (Fe2O3)

Banded iron formation fragment (likely hematite–magnetite ironstone)

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and microcrystalline quartz (SiO₂)

Ironstone Concretion (Limonite/Goethite)

Goethite-rich Concretion (FeO(OH))

Blue Calcite Sphere

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Barite (Desert Diamond)

Barite (Barium Sulfate, BaSO4)

Small ironstone pebble (likely limonite/goethite-rich concretion)

Goethite, α-FeO(OH), with possible limonite and quartz or clay impurities

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Pyrite with Limonite/Goethite Alteration (Pseudomorph)

Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)

Quartz

Silicon Dioxide (SiO2)

Jasper

Microcrystalline quartz (SiO2)

Banded iron formation fragment (tumbled iron-rich rock)

Banded iron formation (BIF), chiefly hematite–magnetite with chert (SiO₂)

Chert

Microcrystalline Quartz (SiO2)

Banded iron formation pebble

Banded iron formation (BIF), chiefly hematite/magnetite with chert or jasper

Coquina

Biogenic Limestone (Coquina)

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Honey Calcite

Calcium Carbonate (CaCO3)

Jasper

Silicon Dioxide (SiO2), Microcrystalline Quartz

Quartz

Silicon Dioxide (SiO2)

Agate

Chalcedony (Silicon Dioxide, SiO2)

Banded iron formation fragment (likely hematite–magnetite ironstone)

BIF; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica as microcrystalline quartz (SiO₂)

Chert (Quartzite-rich River Pebble)

Silicon Dioxide (SiO2)

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)

Chert / Microcrystalline Quartz

Chert (SiO2)

Chert (Light Grey / Flint variant)

Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Hematite Nodular Iron Ore

Hematite (Fe2O3)

Calcite crystal cluster

Calcite, calcium carbonate (CaCO₃)