Rock Identifier

Category

Sedimentary (Secondary Mineral Formation)

Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.

Agate Geode (Chalcedony (SiO2 - Silicon Dioxide)) — sedimentary (secondary mineral formation)

Agate Geode

Chalcedony (SiO2 - Silicon Dioxide)

sedimentary (secondary mineral formation)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Fluorite, Turquoise, and Calcite set (Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)) — mineral

Fluorite, Turquoise, and Calcite set

Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)

Limonite and Goethite (Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))) — mineral

Limonite and Goethite

Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))

Rhodochrosite (Manganese carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese carbonate (MnCO3)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — mineral

Ferruginous Quartz

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

Quartz Geode (Silicon Dioxide (SiO2) in a Secondary Formation) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Formation

Quartz Geode (with possible Manganese or Goethite coating) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous/Banded) (Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous/Banded)

Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)

Quartz Geode (Cracked Open Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (Cracked Open Fragment)

Silicon Dioxide (SiO2)

Pyrite on Quartz matrix (Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)) — mineral

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Hematite (Hematite (Iron(III) oxide, Fe2O3)) — mineral

Hematite

Hematite (Iron(III) oxide, Fe2O3)

Sandstone with Secondary Mineral Encrustation (Arenite with Silica/Calcite deposits (SiO2 or CaCO3)) — sedimentary

Sandstone with Secondary Mineral Encrustation

Arenite with Silica/Calcite deposits (SiO2 or CaCO3)

Ferruginous Quartz (Iron-stained Quartz) (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — Mineral

Ferruginous Quartz (Iron-stained Quartz)

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

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Agate (Silicon Dioxide (SiO2)) — mineral

Agate

Silicon Dioxide (SiO2)

Sandstone Concretion with Quartz Center (Sedimentary Clastic Rock (SiO2 matrix with Quartz core)) — sedimentary

Sandstone Concretion with Quartz Center

Sedimentary Clastic Rock (SiO2 matrix with Quartz core)

Rhodochrosite (Manganese carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese carbonate (MnCO3)

Agate (Silicon Dioxide (SiO2) - variety Chalcedony) — mineral

Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Banded Slate or Siltstone with Quartz/Calcite Veins (Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)) — metamorphic

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Banded Agate (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Native Sulfur (Sulfur (S)) — mineral

Native Sulfur

Sulfur (S)

Chalcedony in Limestone Host Rock (Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)) — Mineral within Sedimentary Rock

Chalcedony in Limestone Host Rock

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Mineral within Sedimentary Rock

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Calcite with iron staining (Calcium Carbonate (CaCO3)) — mineral

Calcite with iron staining

Calcium Carbonate (CaCO3)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous) (Arenite (composed primarily of SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Limonite with Trace Fossils (Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)) — sedimentary

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Optical Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Optical Calcite

Calcite (Calcium Carbonate, CaCO3)

Yellow Agate (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral

Yellow Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Agate (Silicon dioxide (SiO2)) — mineral

Agate

Silicon dioxide (SiO2)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Ironstone Concretion / Goethite-Hematite Nodule (Goethite/Hematite (α-FeO(OH) / Fe2O3)) — sedimentary

Ironstone Concretion / Goethite-Hematite Nodule

Goethite/Hematite (α-FeO(OH) / Fe2O3)

Carnelian (SiO2 (Silicon Dioxide) - Translucent Chalcedony) — mineral

Carnelian

SiO2 (Silicon Dioxide) - Translucent Chalcedony

Botryoidal Hematite (Kidney Ore) (Hematite (Fe2O3)) — mineral

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Specular Hematite (Specularite) (Iron Oxide (Fe2O3)) — mineral

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Specular Hematite (Hematite (Fe2O3)) — mineral

Specular Hematite

Hematite (Fe2O3)

Limonite (Gozzany Iron) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Gozzany Iron)

Limonite (FeO(OH)·nH2O)

Turquoise and Hematite (CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)) — mineral

Turquoise and Hematite

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)