Rock Identifier

Category

Sedimentary Or Igneous (Secondary Formation)

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

Learn about Sedimentary Or Igneous (Secondary Formation) in the encyclopedia

Banded Iron Formation

Banded Iron Formation

Itabirite

Jaspillite

Carbonatite

Conglomerate

Quartzite Sandstone

Quartzite Sandstone

Breccia

Ironstone

Lamproite

Troctolite

Basalt

Gabbro

Quartz (likely tumbled or naturally water-worn) (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Jade (Yellow Chalcedony/Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Jade (Yellow Chalcedony/Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Red Hematite (Iron(III) Oxide (Fe2O3)) — mineral

Red Hematite

Iron(III) Oxide (Fe2O3)

Yellow Chalcedony (likely carnelian or yellow agate) (Silicon Dioxide (SiO₂)) — mineral

Yellow Chalcedony (likely carnelian or yellow agate)

Silicon Dioxide (SiO₂)

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

Hematite

Hematite (Iron(III) oxide, Fe2O3)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Gneiss (Metamorphic Gneiss) — metamorphic

Gneiss

Metamorphic Gneiss

Basalt Pebble with Quartz Veining (Basalt (extrusive volcanic rock)) — igneous

Basalt Pebble with Quartz Veining

Basalt (extrusive volcanic rock)

Ruby (Raw Corundum) (Al2O3 (Aluminum Oxide)) — mineral

Ruby (Raw Corundum)

Al2O3 (Aluminum Oxide)

Agate (Fortification Agate) (Banded Chalcedony (SiO2)) — mineral

Agate (Fortification Agate)

Banded Chalcedony (SiO2)

Citrine or Yellow Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Aquamarine (Beryl (Be3Al2Si6O18 with Fe2+ impurities)) — mineral

Aquamarine

Beryl (Be3Al2Si6O18 with Fe2+ impurities)

Native Gold (in Jewelry) (Gold (Au)) — mineral

Native Gold (in Jewelry)

Gold (Au)

Eudialyte (Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2) — mineral

Eudialyte

Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2

Sandstone (Ferruginous) (Clastic sedimentary rock (SiO2 with Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (SiO2 with Fe2O3)

Granite (Granite (composed mainly of Quartz, Feldspar, and Mica)) — igneous

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Fossiliferous Limestone (Biomicrite / Fossiliferous Limestone (CaCO3)) — fossil

Fossiliferous Limestone

Biomicrite / Fossiliferous Limestone (CaCO3)

Dragon Egg Agate (Agate (Silicon Dioxide, SiO2)) — sedimentary

Dragon Egg Agate

Agate (Silicon Dioxide, SiO2)

Granite (Granite) — igneous

Granite

Granite

Greenstone (Metabasalt / Greenschist) — metamorphic

Greenstone

Metabasalt / Greenschist

Banded Gneiss (Gneiss) — metamorphic

Banded Gneiss

Gneiss

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Basalt with Vesicular/Amygdaloidal Alteration (Extrusive Igneous Rock (Mafic)) — igneous

Basalt with Vesicular/Amygdaloidal Alteration

Extrusive Igneous Rock (Mafic)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Fossilized shell fragment, likely bivalve (Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material) — fossil

Fossilized shell fragment, likely bivalve

Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material

Limonite (Iron Ore) (Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)) — Mineral

Limonite (Iron Ore)

Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)

Magnetite (Lodestone) (Magnetite (Fe3O4)) — mineral

Magnetite (Lodestone)

Magnetite (Fe3O4)

Basalt with Amygdules (Amygdaloidal Basalt) — igneous

Basalt with Amygdules

Amygdaloidal Basalt

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

Magnetite (Iron Ore) (Magnetite (Fe3O4)) — mineral

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartz (Quartz (SiO2)) — Mineral

Quartz

Quartz (SiO2)

Vesicular basalt (Basalt, predominantly plagioclase + pyroxene ± olivine; vesicles formed by trapped volcanic gas) — igneous

Vesicular basalt

Basalt, predominantly plagioclase + pyroxene ± olivine; vesicles formed by trapped volcanic gas

Weathered volcanic rock, likely andesite (Andesite (plagioclase–pyroxene volcanic rock), identification tentative) — igneous

Weathered volcanic rock, likely andesite

Andesite (plagioclase–pyroxene volcanic rock), identification tentative

Turquoise (beads) (Turquoise; CuAl6(PO4)4(OH)8·4H2O) — Mineral

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Weathered basalt pebble with a vesicle (Basalt (fine-grained mafic volcanic rock; commonly plagioclase, clinopyroxene, and Fe-Mg oxides)) — igneous

Weathered basalt pebble with a vesicle

Basalt (fine-grained mafic volcanic rock; commonly plagioclase, clinopyroxene, and Fe-Mg oxides)

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

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Sandstone with Quartz Crystal Infill (Quartz-cemented quartz arenite) — sedimentary

Sandstone with Quartz Crystal Infill

Quartz-cemented quartz arenite

Dalmatian Stone (Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)) — igneous

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)