Rock Identifier

Category

Sedimentary (Secondary Formation)

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

Satin Spar (Gypsum) (Calcium Sulfate Dihydrate (CaSO4·2H2O)) — mineral

Satin Spar (Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Banded Agate (Agate (Cryptocrystalline Quartz, SiO2)) — mineral

Banded Agate

Agate (Cryptocrystalline Quartz, SiO2)

Agate (Chert/Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Yellow Jasper (Silicon dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon dioxide (SiO2)

Limonite with Hematite (Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)) — mineral

Limonite with Hematite

Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Chalcedony (Moonstone variant or White Agate) (Silicon Dioxide (SiO₂)) — mineral

Chalcedony (Moonstone variant or White Agate)

Silicon Dioxide (SiO₂)

Chalcedony (Agate/Carnelian variant) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Chert (with Quartz Vein) (Microcrystalline silica (SiO2)) — sedimentary

Chert (with Quartz Vein)

Microcrystalline silica (SiO2)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Limonite Concretion (Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O) — sedimentary

Limonite Concretion

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

Sandstone (Quartzite texture) (Arenite (SiO2 secondary)) — sedimentary

Sandstone (Quartzite texture)

Arenite (SiO2 secondary)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Arenite (composed primarily of SiO2, or Silicon Dioxide)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2, or Silicon Dioxide)

Limestone (Limestone (CaCO3)) — sedimentary

Limestone

Limestone (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Magnetite or Ironstone Nodule (Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule) — mineral

Magnetite or Ironstone Nodule

Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule

Dark gray foliated metamorphic rock, likely slate or phyllite (Slate/phyllite; chiefly quartz, mica, and chlorite) — metamorphic

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Lepidolite (Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]) — Mineral

Lepidolite

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]

Banded Iron Formation (BIF) (Banded Iron Formation) — sedimentary

Banded Iron Formation (BIF)

Banded Iron Formation

Gowganda Tillite (Puddingstone) (Gowganda Formation Conglomerate) — sedimentary

Gowganda Tillite (Puddingstone)

Gowganda Formation Conglomerate

Hematite Beads (Iron Oxide (Fe2O3)) — mineral

Hematite Beads

Iron Oxide (Fe2O3)

Basalt (Basalt) — igneous

Basalt

Basalt

Quartz Geode (Silicon Dioxide (SiO2) in Geode form) — mineral

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Sandstone (Ferruginous) (Arenite (primarily SiO2 with iron oxide cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Chalky Limestone (Carbonate sedimentary rock (CaCO3)) — sedimentary

Chalky Limestone

Carbonate sedimentary rock (CaCO3)

Limonite Geode / Ironstone Nodule (Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)) — mineral

Limonite Geode / Ironstone Nodule

Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)

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

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Tiger's Eye and Hematite (Quartz (SiO2) with Crocidolite inclusions and Hematite (Fe2O3)) — mineral

Tiger's Eye and Hematite

Quartz (SiO2) with Crocidolite inclusions and Hematite (Fe2O3)

Small red-brown mineral or rock fragment (Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide) — mineral

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Small rounded pebble (Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion) — sedimentary

Small rounded pebble

Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion

Quartz (Iron-stained / Orange Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained / Orange Quartz)

Silicon Dioxide (SiO2)

Red Jasper (Silicon dioxide / Quartz (SiO2 (+Fe2O3))) — sedimentary

Red Jasper

Silicon dioxide / Quartz (SiO2 (+Fe2O3))

Botryoidal Chalcedony with Iron Staining (Microcrystalline Quartz (SiO2)) — mineral

Botryoidal Chalcedony with Iron Staining

Microcrystalline Quartz (SiO2)

Ferruginous Chert (Silicon dioxide with iron oxide impurities (SiO2 + Fe2O3)) — sedimentary

Ferruginous Chert

Silicon dioxide with iron oxide impurities (SiO2 + Fe2O3)

Vanadinite on Barite (Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)) — mineral

Vanadinite on Barite

Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)

Limonite on Sandstone (Iron Oxyhydroxide (FeO(OH)·nH2O) on Quartz Sandstone) — sedimentary

Limonite on Sandstone

Iron Oxyhydroxide (FeO(OH)·nH2O) on Quartz Sandstone