Rock Identifier

Category

Igneous, Sedimentary, Metamorphic, Mineral, Gemstone, Fossil, Or Meteorite

Browse igneous, sedimentary, metamorphic, mineral, gemstone, fossil, or meteorite specimens identified by the Rock Identifier community.

Learn about Igneous, Sedimentary, Metamorphic, Mineral, Gemstone, Fossil, Or Meteorite in the encyclopedia

Coal

Jet

Metagabbro

Calc-Silicate Rock

Calc-Silicate Rock

Pyroxenite

Gneiss

Black Shale

Kambaba Jasper

Feldspar

Malachite

Ironstone Concretion (Siderite or Hematite Concretion (FeCO3 or Fe2O3)) — sedimentary

Ironstone Concretion

Siderite or Hematite Concretion (FeCO3 or Fe2O3)

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation (SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)) — mineral

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Quartz with Inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz with Inclusions

Silicon Dioxide (SiO2)

Ironstone Concretion / Goethite Nodules (Ironstone (composed primarily of Goethite FeO(OH) and Limonite)) — sedimentary

Ironstone Concretion / Goethite Nodules

Ironstone (composed primarily of Goethite FeO(OH) and Limonite)

Ironstone Concretion (Ferruginous Concretion (Fe2O3·nH2O)) — sedimentary

Ironstone Concretion

Ferruginous Concretion (Fe2O3·nH2O)

Ironstone (Limonite/Hematite) (Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)) — sedimentary

Ironstone (Limonite/Hematite)

Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Quartz (Rose Quartz or Jasper variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Rose Quartz or Jasper variety)

Silicon Dioxide (SiO2)

Fossil oyster shell (Fossilized bivalve, likely Ostrea or Crassostrea; calcite (CaCO₃) shell) — fossil

Fossil oyster shell

Fossilized bivalve, likely Ostrea or Crassostrea; calcite (CaCO₃) shell

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

Quartz (Milky/Snow)

Silicon Dioxide (SiO2)

Blue Apatite (Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Weathered chert or silicified limestone nodule (Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing) — sedimentary

Weathered chert or silicified limestone nodule

Microcrystalline quartz (SiO₂), possibly replacing limestone; exact identification requires testing

Ironstone Concretion (Siderite or Limonite Concretion) — sedimentary

Ironstone Concretion

Siderite or Limonite Concretion

Ironstone Concretion (Siderite or Hematite Concretion) — sedimentary

Ironstone Concretion

Siderite or Hematite Concretion

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Ironstone Concretion (Ferruginous Concretion) — sedimentary

Ironstone Concretion

Ferruginous Concretion

Sandstone Concretion (Sandstone (Sedimentary rock, mostly SiO2)) — sedimentary

Sandstone Concretion

Sandstone (Sedimentary rock, mostly SiO2)

Ironstone concretion (Siderite or Limonite-rich Concretion (FeO(OH)·nH2O)) — sedimentary

Ironstone concretion

Siderite or Limonite-rich Concretion (FeO(OH)·nH2O)

Quartz (SiO2 (Silicon Dioxide)) — mineral

Quartz

SiO2 (Silicon Dioxide)

Iron Concretion (Ferruginous concretion (Fe2O3·nH2O / FeO(OH))) — sedimentary

Iron Concretion

Ferruginous concretion (Fe2O3·nH2O / FeO(OH))

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Limonite Concretion (Goethite-Limonite (FeO(OH)·nH2O)) — sedimentary

Limonite Concretion

Goethite-Limonite (FeO(OH)·nH2O)

Sandstone Concretion (Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)) — sedimentary

Sandstone Concretion

Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Ironstone Concretion (Limonite/Goethite) (Ironstone (composed primarily of Goethite FeO(OH) and Limonite)) — sedimentary

Ironstone Concretion (Limonite/Goethite)

Ironstone (composed primarily of Goethite FeO(OH) and Limonite)

Peridot (Olivine) (Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)) — mineral

Peridot (Olivine)

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Orange/Pink variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Orange/Pink variety)

Silicon Dioxide (SiO2)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Blue Apatite (Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Ironstone Concretion (Siderite or Goethite Concretion) — sedimentary

Ironstone Concretion

Siderite or Goethite Concretion

Blue Quartz (Silicon Dioxide (SiO2) with inclusions) — mineral

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

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

Quartz Crystal Rock

Silicon Dioxide (SiO2)

Concretion (Sedimentary Concretion (e.g., Siderite or Ironstone)) — sedimentary

Concretion

Sedimentary Concretion (e.g., Siderite or Ironstone)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Ironstone Concretion (Limonite/Goethite) (Iron oxide concretion (contains FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion (Limonite/Goethite)

Iron oxide concretion (contains FeO(OH)·nH2O)

Limitation Concretion (Ironstone Concretion (Goethite/Limonite)) — sedimentary

Limitation Concretion

Ironstone Concretion (Goethite/Limonite)

Blue Quartz (Silicon Dioxide (SiO2) with inclusions) — mineral

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

Apatite (Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))) — mineral

Apatite

Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))