Rock Identifier

Category

Igneous, Sedimentary, Metamorphic, And Mineral

Browse igneous, sedimentary, metamorphic, and mineral specimens identified by the Rock Identifier community.

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Quartzite with Mafic Intrusion (Gneiss/Schist Contact) (Metamorphic Quartzite (SiO2) with Amphibole/Biotite Schist) — metamorphic

Quartzite with Mafic Intrusion (Gneiss/Schist Contact)

Metamorphic Quartzite (SiO2) with Amphibole/Biotite Schist

Turquoise (possible Dyed Magnesite/Howlite) (CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise (possible Dyed Magnesite/Howlite)

CuAl6(PO4)4(OH)8·4H2O

Pumice or Tufa/Travertine (Pumice (if igneous) or Calcareous Tufa (if sedimentary)) — igneous/sedimentary

Pumice or Tufa/Travertine

Pumice (if igneous) or Calcareous Tufa (if sedimentary)

igneous/sedimentary

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Banded Agate (Agatized Geode Slice) (Silicon Dioxide (SiO₂)) — mineral

Banded Agate (Agatized Geode Slice)

Silicon Dioxide (SiO₂)

Rainbow Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

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

Red Hematite

Iron(III) Oxide (Fe2O3)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Clear Quartz (Druzy) (Crystalline Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Druzy)

Crystalline Silicon Dioxide (SiO2)

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

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

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

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

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

Yellow Chalcedony (likely carnelian or yellow agate)

Silicon Dioxide (SiO₂)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartzite Pebble (River Rock) (Quartzite (SiO2)) — metamorphic

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Druzy Quartz (Crystalline Silicon Dioxide (SiO2)) — mineral

Druzy Quartz

Crystalline Silicon Dioxide (SiO2)

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

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Gneiss (Granitic Gneiss) (Gneiss) — metamorphic

Gneiss (Granitic Gneiss)

Gneiss

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

Mica Schist with Iron Staining (Muscovite/Biotite Schist) — metamorphic

Mica Schist with Iron Staining

Muscovite/Biotite Schist

Petrified Wood (Silicified wood (primarily Quartz/Chalcedony, SiO2)) — metamorphic

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Tiger Iron (Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)) — metamorphic

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Serpentinite (Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)) — Metamorphic Rock

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Metamorphic Rock

Fuchsite (Chrome Mica) (K(Al,Cr)2(AlSi3O10)(OH)2) — mineral

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — Mineral

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss (Granite Gneiss) (Gneiss) — metamorphic

Gneiss (Granite Gneiss)

Gneiss

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Specular Hematite (Specularite) (Iron Oxide (Fe2O3)) — mineral

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Riverstone (Quartzite or Siltstone cobble) (Quartzite (primarily SiO2)) — metamorphic

Riverstone (Quartzite or Siltstone cobble)

Quartzite (primarily SiO2)

Smoky Quartz and Biotite Schist (Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)) — metamorphic

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Yellow Quartz (Citrine-colored Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine-colored Quartz)

Silicon Dioxide (SiO2)

Ruby (Corundum (mineral species), variety: Ruby (Al2O3 with Cr3+ as the chromophore)) — Mineral

Ruby

Corundum (mineral species), variety: Ruby (Al2O3 with Cr3+ as the chromophore)

Ruby (Corundum (Al2O3:Cr)) — mineral

Ruby

Corundum (Al2O3:Cr)

Quartz with Pyrite inclusions (Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions) — mineral

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Pink Sapphire (Corundum (Al2O3 with trace Chromium and Iron)) — mineral

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Carnelian (Carnelian (SiO2 with Iron Oxide impurities)) — mineral

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

Granite Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Granite Gneiss

Gneiss (High-grade metamorphic rock)