Rock Identifier

Category

Organic Structure (Not A Rock)

Browse organic structure (not a rock) specimens identified by the Rock Identifier community.

Wishing Stone (Basalt with Quartz Vein) (Basalt containing a microcrystalline quartz (SiO2) or calcite vein) — igneous

Wishing Stone (Basalt with Quartz Vein)

Basalt containing a microcrystalline quartz (SiO2) or calcite vein

Sandstone (likely Arkosic) (Clastic Sedimentary Rock) — sedimentary

Sandstone (likely Arkosic)

Clastic Sedimentary Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Tiger's Eye (Mineral Collection) (Tiger's Eye (SiO2 with crocidolite inclusions)) — mineral

Tiger's Eye (Mineral Collection)

Tiger's Eye (SiO2 with crocidolite inclusions)

Amethyst (Amethyst (Silicon Dioxide, SiO2 + Fe)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe)

Pearl (Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)) — mineral

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

Peridotite (Peridotite (Ultramafic Rock)) — igneous

Peridotite

Peridotite (Ultramafic Rock)

Limestone (specifically Dolomitic/Crystalline Limestone) (Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)) — sedimentary

Limestone (specifically Dolomitic/Crystalline Limestone)

Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)

Slate (Foliated Metamorphic Rock) — metamorphic

Slate

Foliated Metamorphic Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Sandstone (likely Siltstone or fine-grained Sandstone) (Sedimentary Rock (Clastic)) — sedimentary

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Basalt (Mafic Igneous Rock) — igneous

Basalt

Mafic Igneous Rock

Slate (Foliated metamorphic rock) — metamorphic

Slate

Foliated metamorphic rock

River Rock (Basalt) (Aphanitic Basaltic Rock) — igneous

River Rock (Basalt)

Aphanitic Basaltic Rock

Porphyry (likely Porphyritic Andesite or Basalt) (Porphyritic Igneous Rock) — igneous

Porphyry (likely Porphyritic Andesite or Basalt)

Porphyritic Igneous Rock

Granite (Weathered) (Granitic intrusive rock) — igneous

Granite (Weathered)

Granitic intrusive rock

Ocean Jasper (Orbicular Jasper) (Silicon Dioxide (SiO2) with iron and other impurities) — sedimentary

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and other impurities

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

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Basalt River Stone (Basaltic Igneous Rock) — igneous

Basalt River Stone

Basaltic Igneous Rock

Siltstone or Mudstone (Argillaceous sedimentary rock) — sedimentary

Siltstone or Mudstone

Argillaceous sedimentary rock

Gabbro (Plutonic mafic rock) — igneous

Gabbro

Plutonic mafic rock

Shale or Siltstone (Sedimentary Rock (Siliciclastic)) — sedimentary

Shale or Siltstone

Sedimentary Rock (Siliciclastic)

Slate (Slate (Metamorphic Rock)) — metamorphic

Slate

Slate (Metamorphic Rock)

Foliated Metamorphic Rock (likely Gneiss or Schist) (Gneissic Metamorphic Rock) — metamorphic

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Conglomerate (Conglomerate (SiO2 matrix with various silicate clasts)) — sedimentary

Conglomerate

Conglomerate (SiO2 matrix with various silicate clasts)

Banded Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic Rock)

Granitic Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Granitic Gneiss

Gneiss (Metamorphic Rock)

Gneiss (Gneissic Metamorphic Rock) — metamorphic

Gneiss

Gneissic Metamorphic Rock

Granodiorite (Granodiorite (Intermediate to Felsic Intrusive Rock)) — igneous

Granodiorite

Granodiorite (Intermediate to Felsic Intrusive Rock)

Conglomerate (Conglomerate Rock (Paraconglomerate)) — sedimentary

Conglomerate

Conglomerate Rock (Paraconglomerate)

Pumice (Pumice (Vesicular Rhyolite/Andesite)) — igneous

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Gneiss (High-grade foliated metamorphic rock) — metamorphic

Gneiss

High-grade foliated metamorphic rock

Greenschist (Greenschist facies rock) — Metamorphic

Greenschist

Greenschist facies rock

Gneiss (Gneiss (a metamorphic rock)) — Metamorphic

Gneiss

Gneiss (a metamorphic rock)

Granite (Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)) — igneous

Granite

Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)

Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Quartz Vein in Host Rock (Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix) — Metamorphic or Igneous (context dependent)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Metamorphic or Igneous (context dependent)

Sandstone (Quartzose) (Arenite (Formula: SiO2 primary, with various cements)) — sedimentary

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Lapis Lazuli (Lapis Lazuli (a rock type, not a single mineral; main component is Lazurite (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)])) — Metamorphic Rock (primarily composed of minerals)

Lapis Lazuli

Lapis Lazuli (a rock type, not a single mineral; main component is Lazurite (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)])

Metamorphic Rock (primarily composed of minerals)

Granite (Phaneritic Intrusive Igneous Rock (Granite)) — igneous

Granite

Phaneritic Intrusive Igneous Rock (Granite)

Sandstone with trace fossil (Sandstone, possibly with Skolithos or similar trace fossil) — sedimentary

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil