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

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Hematite (Ferric Oxide (Fe2O3)) — mineral

Hematite

Ferric Oxide (Fe2O3)

Dyed Pink Agate Slice (Cryptocrystalline variety of Quartz (SiO2)) — mineral

Dyed Pink Agate Slice

Cryptocrystalline variety of Quartz (SiO2)

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

Hematite

Iron(III) oxide (Fe2O3)

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

Hematite

Iron(III) oxide (Fe2O3)

Pyrite (Iron disulfide (FeS2)) — mineral

Pyrite

Iron disulfide (FeS2)

Clear Quartz (Rock Crystal) (Quartz (Silicon Dioxide, SiO2)) — mineral

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

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

Hematite

Iron(III) oxide (Fe2O3)

Clear Quartz Crystal Cluster (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Green Aventurine (Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Greenstone (Metabasalt / Greenschist) — metamorphic

Greenstone

Metabasalt / Greenschist

Granite (Granite (Intrusive Igneous Rock)) — igneous

Granite

Granite (Intrusive Igneous Rock)

Yellow Agate (Silicon Dioxide (SiO2)) — mineral

Yellow Agate

Silicon Dioxide (SiO2)

Hypersthene (or Enstatite/Ferrosilite) (Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)) — Mineral

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Amygdaloidal Basalt (Extrusive Igneous Rock with Secondary Mineral Fillings) — igneous

Amygdaloidal Basalt

Extrusive Igneous Rock with Secondary Mineral Fillings

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Sodalite (Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Na8(Al6Si6O24)Cl2

Plagioclase Feldspar (Plagioclase (NaAlSi3O8 - CaAl2Si2O8)) — mineral

Plagioclase Feldspar

Plagioclase (NaAlSi3O8 - CaAl2Si2O8)

Gneiss (Metamorphic Gneiss) — metamorphic

Gneiss

Metamorphic Gneiss

Amethyst Beads (Quartz (Silicon Dioxide, SiO2 with iron impurities)) — gemstone

Amethyst Beads

Quartz (Silicon Dioxide, SiO2 with iron impurities)

K2 Jasper (K2 Stone) (Azurite in Granite / Quartzite) — metamorphic

K2 Jasper (K2 Stone)

Azurite in Granite / Quartzite

Banded Gneiss (Gneiss) — metamorphic

Banded Gneiss

Gneiss

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

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

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)

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

Quartz Geode Fragment

Silicon Dioxide (SiO2)

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

Limonite Geode / Ironstone Nodule

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

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

Dragon Egg Agate

Agate (Silicon Dioxide, SiO2)

Jasper and Chalcedony (Silicon Dioxide (SiO2) microcrystalline quartz) — sedimentary

Jasper and Chalcedony

Silicon Dioxide (SiO2) microcrystalline quartz

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)

Bivalve Fossil (Clam) (Class Bivalvia, likely Mercenaria or similar genus) — fossil

Bivalve Fossil (Clam)

Class Bivalvia, likely Mercenaria or similar genus

Travertine (Calcium Carbonate (CaCO3)) — sedimentary

Travertine

Calcium Carbonate (CaCO3)

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

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O