Rock Identifier

Category

Mineral Or Sedimentary (If Chert)

Browse mineral or sedimentary (if chert) specimens identified by the Rock Identifier community.

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

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Biotite Mica (K(Mg, Fe)3AlSi3O10(F, OH)2) — mineral

Biotite Mica

K(Mg, Fe)3AlSi3O10(F, OH)2

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Blue Kyanite (Kyanite (Al2SiO5)) — mineral

Blue Kyanite

Kyanite (Al2SiO5)

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

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Magnetite (likely with weathered Limonite/Hematite) (Magnetite (Fe3O4) with iron oxide weathering) — mineral

Magnetite (likely with weathered Limonite/Hematite)

Magnetite (Fe3O4) with iron oxide weathering

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

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Vanadinite (Vanadinite (Pb5(VO4)3Cl)) — mineral

Vanadinite

Vanadinite (Pb5(VO4)3Cl)

Pyrite (on Quartz matrix) (Iron Sulfide (FeS2)) — mineral

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Quartz (Grain/Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

Blue Kyanite (Kyanite (Al2SiO5)) — mineral

Blue Kyanite

Kyanite (Al2SiO5)

Quartz (specifically Milky or Clear Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Titanium-Coated Hematite (Aura Hematite) (Titanium-bonded Hematite (Fe2O3 with a Ti coating)) — mineral

Titanium-Coated Hematite (Aura Hematite)

Titanium-bonded Hematite (Fe2O3 with a Ti coating)

Celestite (Celestine) (Celestine (Strontium Sulfate, SrSO4)) — Mineral

Celestite (Celestine)

Celestine (Strontium Sulfate, SrSO4)

Fancy Jasper (Silicon Dioxide (SiO2)) — mineral

Fancy Jasper

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz) (Silicon Dioxide (SiO2) with iron inclusions) — mineral

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Mica Schist (Mica Schist (KAl2(AlSi3O10)(OH)2)) — metamorphic

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2)

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Zebra Jasper (Silicon Dioxide (SiO2) with various inclusions) — metamorphic/sedimentary

Zebra Jasper

Silicon Dioxide (SiO2) with various inclusions

metamorphic/sedimentary

Yellow Aventurine (or Citrine-colored Quartz) (Silicon Dioxide (SiO2) with inclusions) — metamorphic

Yellow Aventurine (or Citrine-colored Quartz)

Silicon Dioxide (SiO2) with inclusions

Ironstone with Limonite/Goethite coating (Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)) — sedimentary

Ironstone with Limonite/Goethite coating

Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)

Green Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Green Jasper

Jasper (Silicon Dioxide, SiO2)

Quartz Geode with Chalcedony (Silicon Dioxide (SiO2) in Geode Form) — sedimentary

Quartz Geode with Chalcedony

Silicon Dioxide (SiO2) in Geode Form

Quartz Geode (Unbroken) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode (Unbroken)

Silicon Dioxide (SiO2)

Sandstone (Arenite (predominantly SiO2 quartz grains)) — sedimentary

Sandstone

Arenite (predominantly SiO2 quartz grains)

Septarian Nodule (Septarian Stone) (Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)) — sedimentary

Septarian Nodule (Septarian Stone)

Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)

Jasper (Red/Brown Variety) (Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)) — sedimentary

Jasper (Red/Brown Variety)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)

Red Jasper (Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Sandstone Concretion (Moqui Marble (Iron-oxide concretion)) — sedimentary

Sandstone Concretion

Moqui Marble (Iron-oxide concretion)

Ironstone Concretion (Siderite or Hematite-bonded Concretion) — sedimentary

Ironstone Concretion

Siderite or Hematite-bonded Concretion

Jasper (var. Ocean or Polychrome Jasper) (Silicon Dioxide (SiO2) with iron and mineral inclusions) — sedimentary

Jasper (var. Ocean or Polychrome Jasper)

Silicon Dioxide (SiO2) with iron and mineral inclusions

Geode (Quartz chalcedony variety) (SiO2 (Silicon Dioxide)) — sedimentary

Geode (Quartz chalcedony variety)

SiO2 (Silicon Dioxide)

Travertine (Travertine (CaCO3 - Calcium Carbonate)) — sedimentary

Travertine

Travertine (CaCO3 - Calcium Carbonate)

Flagstone (Sandstone) (Clastic Sedimentary Rock (composed of quartz and feldspar)) — sedimentary

Flagstone (Sandstone)

Clastic Sedimentary Rock (composed of quartz and feldspar)

Jasper (Banded Jasper) (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with impurities

Agate (Silicon dioxide (SiO2) - variety of chalcedony) — sedimentary

Agate

Silicon dioxide (SiO2) - variety of chalcedony

Limonite (Iron Ore) (Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Sandstone (Ferruginous) (Arenite (Fe2O3 rich)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe2O3 rich)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)